Rashi on Genesis
ויהי כבא אברם מצרימה AND IT CAME TO PASS WHEN ABRAM WAS COME INTO EGYPT —It should have said, “when they were come into Egypt”; but the use of the singular teaches us that he hid her in a chest, and when they demanded the custom dues they opened it and discovered her (Genesis Rabbah 40:5).
Sforno on Genesis
ויראו המצרים, all of them, when looking at Sarai, entertained the very thoughts Avraham had anticipated.