Therefore God dealt well with the midwives: and the people multiplied, and waxed very mighty.

Wesley's Notes

1:20 Therefore God dealt well with them - That is, built them up in families, and blessed their children.

Jamieson-Fausset-Brown Bible Commentary

20, 21. God dealt well with the midwives-This represents God as rewarding them for telling a lie. This difficulty is wholly removed by a more correct translation. To "make" or "build up a house" in Hebrew idiom, means to have a numerous progeny. The passage then should be rendered thus: "God protected the midwives, and the people waxed very mighty; and because the midwives feared, the Hebrews grew and prospered."

Matthew Henry's Concise Commentary

1:15-22 The Egyptians tried to destroy Israel by the murder of their children. The enmity that is in the seed of the serpent, against the Seed of the woman, makes men forget all pity. It is plain that the Hebrews were now under an uncommon blessing. And we see that the services done for God's Israel are often repaid in kind. Pharaoh gave orders to drown all the male children of the Hebrews. The enemy who, by Pharaoh, attempted to destroy the church in this its infant state, is busy to stifle the rise of serious reflections in the heart of man. Let those who would escape, be afraid of sinning, and cry directly and fervently to the Lord for assistance.