Eusebius of Caesarea
Catena Aurea · Lukasevangelium 13
Then said he, Unto what is the kingdom of God like? and whereunto shall I resemble it? It is like a grain of mustard seed, which a man took, and cast into his garden; and it grew, and waxed a great tree; and the fowls of the air lodged in the branches of it. And again he said, Whereunto shall I liken the kingdom of God? It is like leaven, which a woman took and hid in three measures of meal, till the whole was leavened. He next likens the kingdom of God to leaven, for it follows, And again he says, Whereunto shall I liken it? It is like to leaven, &c.
Or else, by the leaven our Lord means the Holy Spirit, the Sower proceeding (as it were) from the seed, which is the word of God. But the three measures of meal, signify the knowledge of the Father, and the Son, and the Holy Spirit, which the woman, that is, Divine wisdom, and the Holy Spirit, impart.