English: “And she hid him three months” — because the Egyptians counted only from the time Amram remarried her, while she had already been pregnant with him for three months beforehand.
On the daf / in context: See the cited source for the full section.
Type of Learning
Custom — chronological calculation.
What Is Learned
Chazal teach that the three months of concealment correspond to the period the Egyptians could not yet have expected a birth from the remarriage.