Genesis 20:4

לא קרב אליה HE HAD NOT COME NEAR HER — The Angel prevented him, as it is said (v. 6) “I have not permitted thee to touch her” (cf. Genesis Rabbah 52). הגוי גם צדיק תהרוג WILT THOU SLAY ALSO A RIGHTEOUS NATION? — Even though it be righteous will you slay it? Is such perhaps Your usual way— to destroy nations without cause? That is what you did to the generation of the Flood and to the generation of the Dispersal. I may indeed say that you slew them without proper cause, just as you think to kill me without cause (Genesis Rabbah 52:6).

וַאֲבִימֶ֕לֶךְ לֹ֥א קָרַ֖ב אֵלֶ֑יהָ וַיֹּאמַ֕ר אֲדֹנָ֕י הֲג֥וֹי גַּם־צַדִּ֖יק תַּהֲרֹֽג׃

But Avimelekh had not come near her: and he said, Lord, wilt Thou slay also a righteous nation?