Where can I find what the Bible says about communion? Is the frequency left up to each individual?

Should we take the communion whenever we want or is there a prescribed frequency?

What most Christian denominations call "communion" is a substantially altered version of the original New Testament Passover service, in method, custom and especially frequency. In most cases it has become a humanly devised substitute for the Passover service the Bible commands.

When originally introduced to the nation of Israel in the Old Testament, the Passover was clearly a once-a-year observance (Exodus 12:1-2 [1] And the Lord spake unto Moses and Aaron in the land of Egypt, saying,
[2] This month shall be unto you the beginning of months: it shall be the first month of the year to you.

See All...). When God again listed His worship festivals (including the Passover) in Leviticus 23, each except for the weekly Sabbath was solely an annual event. The Passover plainly prefigures the sacrifice of Christ for our sins (John 1:29The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world.
See All...). So likewise Jesus and His disciples kept the Passover every year at the appointed time (see Matthew 26:17Now the first day of the feast of unleavened bread the disciples came to Jesus, saying unto him, Where wilt thou that we prepare for thee to eat the passover?
See All...; Mark 14:12And the first day of unleavened bread, when they killed the passover, his disciples said unto him, Where wilt thou that we go and prepare that thou mayest eat the passover?
See All...; Luke 22:7-13 [7] Then came the day of unleavened bread, when the passover must be killed.
[8] And he sent Peter and John, saying, Go and prepare us the passover, that we may eat.
[9] And they said unto him, Where wilt thou that we prepare?
[10] And he said unto them, Behold, when ye are entered into the city, there shall a man meet you, bearing a pitcher of water; follow him into the house where he entereth in.
[11] And ye shall say unto the goodman of the house, The Master saith unto thee, Where is the guestchamber, where I shall eat the passover with my disciples?
[12] And he shall shew you a large upper room furnished: there make ready.
[13] And they went, and found as he had said unto them: and they made ready the passover.

See All...).

Notice that Jesus had observed the Passover annually from very early youth. "His parents went to Jerusalem every year at the Feast of the Passover. And when He was twelve years old, they went up to Jerusalem according to the custom of the Feast. When they had finished the days [plural] ..." (Luke 2:41-43 [41] Now his parents went to Jerusalem every year at the feast of the passover.
[42] And when he was twelve years old, they went up to Jerusalem after the custom of the feast.
[43] And when they had fulfilled the days, as they returned, the child Jesus tarried behind in Jerusalem; and Joseph and his mother knew not of it.

See All..., emphasis added throughout). The entire annual spring festival period included the biblically commanded Days of Unleavened Bread as well.

From these and other scriptures we can rightly conclude that the Passover service is an annual observance. Following Christ's example and instruction, it is to be kept with mutual footwashing by brethren (John 13:1-17 [1] Now before the feast of the passover, when Jesus knew that his hour was come that he should depart out of this world unto the Father, having loved his own which were in the world, he loved them unto the end.
[2] And supper being ended, the devil having now put into the heart of Judas Iscariot, Simon's son, to betray him;
[3] Jesus knowing that the Father had given all things into his hands, and that he was come from God, and went to God;
[4] He riseth from supper, and laid aside his garments; and took a towel, and girded himself.
[5] After that he poureth water into a bason, and began to wash the disciples' feet, and to wipe them with the towel wherewith he was girded.
[6] Then cometh he to Simon Peter: and Peter saith unto him, Lord, dost thou wash my feet?
[7] Jesus answered and said unto him, What I do thou knowest not now; but thou shalt know hereafter.
[8] Peter saith unto him, Thou shalt never wash my feet. Jesus answered him, If I wash thee not, thou hast no part with me.
[9] Simon Peter saith unto him, Lord, not my feet only, but also my hands and my head.
[10] Jesus saith to him, He that is washed needeth not save to wash his feet, but is clean every whit: and ye are clean, but not all.
[11] For he knew who should betray him; therefore said he, Ye are not all clean.
[12] So after he had washed their feet, and had taken his garments, and was set down again, he said unto them, Know ye what I have done to you?
[13] Ye call me Master and Lord: and ye say well; for so I am.
[14] If I then, your Lord and Master, have washed your feet; ye also ought to wash one another's feet.
[15] For I have given you an example, that ye should do as I have done to you.
[16] Verily, verily, I say unto you, The servant is not greater than his lord; neither he that is sent greater than he that sent him.
[17] If ye know these things, happy are ye if ye do them.

See All...) and the partaking of a small amount of unleavened bread and a sip of wine as symbols of His body and blood (Matthew 26:26-30 [26] And as they were eating, Jesus took bread, and blessed it, and brake it, and gave it to the disciples, and said, Take, eat; this is my body.
[27] And he took the cup, and gave thanks, and gave it to them, saying, Drink ye all of it;
[28] For this is my blood of the new testament, which is shed for many for the remission of sins.
[29] But I say unto you, I will not drink henceforth of this fruit of the vine, until that day when I drink it new with you in my Father's kingdom.
[30] And when they had sung an hymn, they went out into the mount of Olives.

See All...).

Scripture gives no hint of the early Church adding to or changing the dates originally ordained for God's festivals. The phrase concerning the Passover in 1 Corinthians 11:26For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come.
See All...—"for as often as you eat this bread and drink this cup"—simply points out that by observing the Passover each year on the appropriate day, members of the Church "proclaim the Lord's death till He comes." Memorials such as this are held once a year —certainly the custom of most of mankind in commemorating most events.

Some scholars have understood that Jesus did not authorize the altering of the frequency of the Passover observance. Notice the following admission: "1 Cor 11:24And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me.
See All...; Luke 22:19And he took bread, and gave thanks, and brake it, and gave unto them, saying, This is my body which is given for you: this do in remembrance of me.
See All...: 'Do this in remembrance of me' ... They [these words of Christ] express the wish of Jesus that the annual Passover should be observed in His memory until the rendezvous in the Kingdom.

"The fact that the Church came to remember the Lord in the weekly breaking of bread and not at the annual Passover should not be brought against the strong probability that what Jesus expected was the latter [i.e., annual observance]" ( Studies in Biblical Theology , No. 6: The Lord's Supper in the New Testament , A.J.B. Higgins, 1956, p. 55).

In summary, the Bible specifies the yearly observance of the Passover, and history records its annual celebration as the practice of the early Church.

Passover, as a memorial of Jesus' death, is to be observed annually on the 14th day of the first month of the Hebrew calendar—just as all of God's other festivals (except the weekly Sabbath) are to be kept once a year. No biblical precedent, practice or instructions sanction doing otherwise.

Regrettably, one of the "hidden" effects for insisting on multiple observances of communion in place of the Passover is that it encourages unsuspecting people to ignore the other true biblical festivals and view them as unnecessary. But observing them is essential if we wish to obey God and truly understand the meaning of His plan for humanity! To better understand the significance of these biblical festivals, request or download our free booklet God's Holy Day Plan: The Promise of Hope for All Mankind.