Webster's 1828 Dictionary Definition:

LEAVEN, noun lev'n. [Latin levo, Eng. to lift.]

1. A mass of sour dough, which, mixed with a larger quantity of dough or paste, produces fermentation in it and renders it light. During the seven days of the passover, no leaven was permitted to be in the houses of the Jews. Exodus 12:15.

2. Any thing which makes a general change in the mass. It generally means something which corrupts or depraves that with which it is mixed.

Beware of the leaven of the Pharisees and of the Sadducees. Matthew 16:6.

LEAVEN, verb transitive lev'n.

1. To excite fermentation in; to raise and make light, as dough or paste.

A little leaven leaveneth the whole lump. 1 Corinthians 5:6.

2. to taint; to imbue.

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Beware of the leaven (false doctrine) for it is not God’s word

Leaven (false doctrine) which a woman (fallen church) hid into 3 measures of meal (Godhead Name revelation) until the whole was leavened (corrupted).

True Godhead: father, Son, Holy Spirit is Lord Jesus Christ: 1 God, 1 Person, 3 manifestations

Any religious doctrine that teaches more than one God or more than one person in God is false.