ζύμη, 
-ης, 
ἡ, (
ζέω [but cf. Curtius, p. 626f; Vanicek, p. 760]), 
leaven: 
Matthew 13:33; 
Luke 13:21, (
Exodus 12:15; 
Leviticus 2:11; 
Deuteronomy 16:3, etc.; Aristotle, gen. an. 3, 4; Josephus, Antiquities 3, 10, 6; Plutarch, mor., p. 289f [quaest. Rom. 109]); 
τοῦ ἄρτου, 
Matthew 16:12; metaphorically, of inveterate mental and moral corruption, 
1 Corinthians 5:8 [
1 Corinthians 5:7], (Ignatius ad Magnes. 10); viewed in its tendency to infect others, 
ζύμη τῶν Φαρισαίων: 
Matthew 16:6, 
11; 
Mark 8:15; 
Luke 12:1, which figuratively 
Matthew 16:12 explains of the teaching of the Pharisees, Luke, the passage cited more correctly [definitely?] of their hypocrisy. It is applied to that which, though small in quantity, yet by its influence thoroughly pervades a thing: either in a good sense, as in the parable 
Matthew 13:33; 
Luke 13:21, (see 
ζυμόω); or in a bad sense, of a pernicious influence, as in the proverb 
μικρὰ ζύμη ὅλον τὸ φύραμα ζυμοῖ, 
a little leaven leaveneth the whole lump, which is used variously, according to the various things to which it is applied, namely a single sin corrupts a whole church, 
1 Corinthians 5:6; a slight inclination to error (respecting the necessity of circumcision) easily perverts the whole conception of faith, 
Galatians 5:9; but many interpretations explain the passage 'even a few false teachers lead the whole church into error.' 
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