When Avram entered Egypt, the Egyptians saw how very beautiful the woman was.
Bereishis Rabbah 40:5 / Rashi
English: “When Avram entered Egypt” — and where was Sarah? He placed her in a chest and locked it. When he reached customs they said: Pay the duty. He said: I will pay. They said: Perhaps you are transporting garments? He said: I will pay the duty on garments. … When they opened it, the whole land of Egypt was irradiated with her radiance.
Supplementary classical material not listed by Torah Temimah under this exact passuk.