וַיֹּ֥אמֶר אֲבִימֶ֖לֶךְ אֶל־אַבְרָהָ֑ם מָ֣ה רָאִ֔יתָ כִּ֥י עָשִׂ֖יתָ אֶת־הַדָּבָ֥ר הַזֶּֽה׃
And Abimelech said unto Abraham: ‘What sawest thou, that thou hast done this thing?’
Read midrashic interpretation of Genesis 20:10: and classical rabbinic exegesis.