Jamieson, Fausset and Brown on Exodus 1:20-21

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."