א֛וֹ דֶּ֥בֶר אֲשַׁלַּ֖ח אֶל־הָאָ֣רֶץ הַהִ֑יא וְשָׁפַכְתִּ֨י חֲמָתִ֤י עָלֶ֙יהָ֙ בְּדָ֔ם לְהַכְרִ֥ית מִמֶּ֖נָּה אָדָ֥ם וּבְהֵמָֽה׃
或者，若我使瘟疫臨到那地，在流血中將我的忿怒傾倒在那地上，要將人和牲畜從其中剪除；
Pirkei DeRabbi Eliezer
Hence they said: If there be fifty righteous in the world, the world exists through their righteousness. (Abraham) arose and began to beseech (God), and made supplication before Him until he brought (the number down to) ten. Hence (the sages said): (When there are) ten people in a place, the place is delivered by their righteousness, as it is said, "And he said, I will not destroy it for the sake of the ten" (Gen. 18:32).