Therefore, because they feared God, and spared the children, Exodus 1:17, whereby they exposed themselves to the king's displeasure; because they would not offend God by murdering the children, which they might have done many times secretly, and therefore it was only the fear of God which restrained them from it.
Related Commentaries of Exodus 1:20
Exodus 1:20
20 Therefore God dealt well with the midwives: and the people multiplied, and waxed very mighty.