Reference for I Kings 11:16

כִּ֣י שֵׁ֧שֶׁת חֳדָשִׁ֛ים יָֽשַׁב־שָׁ֥ם יוֹאָ֖ב וְכָל־יִשְׂרָאֵ֑ל עַד־הִכְרִ֥ית כָּל־זָכָ֖ר בֶּאֱדֽוֹם׃

for Joab and all Israel remained there six months, until he had cut off every male in Edom—