“The Lord said to Abraham: Why is it that Sarah laughed, saying: Shall I indeed bear a child, and I have grown old?” (Genesis 18:13). “The Lord said to Abraham: Why is it that Sarah laughed, saying: [Shall I indeed bear a child, and I have grown old?]” – bar Kappara said: Peace [between spouses] is a great thing, as even Scripture spoke untruths in order to establish peace between Abraham and Sarah. “Sarah laughed to herself, saying: After my languishing, shall I have youth, and my husband is old?” But He did not say this to Abraham, but rather, “Why is it that Sarah laughed, saying: Shall I indeed bear a child, and I have grown old?” The verse does not say as Sarah said: “My husband is old,”54So that Abraham should not feel that Sarah had slighted him. but rather, “I have grown old.”
Abraham — Kingdom of Sarah
Bereshit Rabbah 48:18