Neither shall there be leaven seen with thee in all thy quarters.
The fear of the Lord is to hate evil. — Abhor that which is evil. — Abstain from all appearance of evil. — Looking diligently lest any man fail of the grace of God; lest any root of bitterness springing up trouble you, and thereby many be defiled.
If I regard iniquity in my heart, the Lord will not hear me.
Know ye not that a little leaven leaveneth the whole lump? 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: 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. — Let a man examine himself, and so let him eat of that bread, and drink of that cup.
Let every one that nameth the name of Christ depart from iniquity. — Such an high priest became us, who is holy, harmless, undefiled, separate from sinners. — In him is no sin.
Leaven is a peculiar thing. It makes bread rise. It keeps cakes from becoming brownies. In the Bible, though, leaven has another meaning--it's what spreads throughout bread or cake, and just a little bit changes the character of whatever it's in. The Israelites were forbidden the use of leaven during certain times of the year, because it is a symbol of what a very small thing can do if it remains where it is. For this reason, leaven is often considered a symbol of evil--little things that change us, make us different; little sins that operate in our lives and personalities, and affect our entire being.
Thus God commands us to remove the "leaven," the things that affect our lives in little ways. What those are, only you know, so listen to the Spirit and let Him guide you, and let the Scriptures be a light on your path to guide you.
EXO. 13:7. Prov. 8:13. ‑Rom. 12:9. ‑I Thes. 5:22. ‑Heb. 12:15. Psa. 66:18. I Cor. 5:6‑8. -I Cor. 11:28. II Tim. 2:19. ‑Heb. 7:26. ‑I John 3:5.