1. It is reported commonly that there is fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father's wife.
2. And ye are puffed up, and have not rather mourned, that he that hath done this deed might be taken away from among you.
3. For I verily, as absent in body, but present in spirit, have judged already, as though I were present, concerning him that hath so done this deed,
4. In the name of our Lord Jesus Christ, when ye are gathered together, and my spirit, with the power of our Lord Jesus Christ,
5. To deliver such an one unto Satan for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus.
6. Your glorying is not good. Know ye not that a little leaven leaveneth the whole lump?
7. Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us:
8. Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.
9. I wrote unto you in an epistle not to company with fornicators:
10. Yet not altogether with the fornicators of this world, or with the covetous, or extortioners, or with idolaters; for then must ye needs go out of the world.
11. But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat.
12. For what have I to do to judge them also that are without? do not ye judge them that are within?
13. But them that are without God judgeth. Therefore put away from among yourselves that wicked person.

Exodus 12:15 Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.

Exodus 13:6 Seven days thou shalt eat unleavened bread, and in the seventh day shall be a feast to the LORD.

Leviticus 23:6 And on the fifteenth day of the same month is the feast of unleavened bread unto the LORD: seven days ye must eat unleavened bread.

Numbers 28:16 And in the fourteenth day of the first month is the passover of the LORD.

Numbers 28:17 And in the fifteenth day of this month is the feast: seven days shall unleavened bread be eaten.

Deuteronomy 16:16 Three times in a year shall all thy males appear before the LORD thy God in the place which he shall choose; in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles: and they shall not appear before the LORD empty:

Isaiah 25:6 And in this mountain shall the LORD of hosts make unto all people a feast of fat things, a feast of wines on the lees, of fat things full of marrow, of wines on the lees well refined.