Leaven

Matthew 13:33
[13:33] Another parable spake he unto them; The kingdom of heaven is like unto leaven, which a woman took, and hid in three measures of meal, till the whole was leavened.

Luke 13:20-21
[13:20] And again he said, Whereunto shall I liken the kingdom of God? [21] It is like leaven, which a woman took and hid in three measures of meal, till the whole was leavened.