Charles Ellicott Commentary Hebrews 11:23

"By faith Moses, when he was born, was hid three months by his parents, because they saw he was a goodly child; and they were not afraid of the king`s commandment." — Hebrews 11:23 (ASV)

Because they saw he was a proper child.—“Proper” has its now obsolete sense of handsome, comely, a meaning not uncommon in Shakespeare. The word used in the Greek translation of Exodus 2:2 is preserved both in Acts 7:20 (see the Note) and in this place.

It would seem that the remarkable beauty of the infant was understood by his parents as a divine sign given for the guidance of their conduct. The next clause should probably be closely connected with this—because they saw...and were not afraid of the king’s commandment (Exodus 1:16). Their reliance on the protection of God enabled them to brave the anger of the king.