Some have thought that the houses here spoken of, which God is said to have built for them, means that they were incorporated and built up in the faith of God's people. Psalms 107:41.
Related Commentaries of Exodus 1:20
Exodus 1:20-21
20 Therefore God dealt well with the midwives: and the people multiplied, and waxed very mighty.
21 And it came to pass, because the midwives feared God, that he made them houses.