וְאִֽם־יִתְקְפוֹ֙ הָאֶחָ֔ד הַשְּׁנַ֖יִם יַעַמְד֣וּ נֶגְדּ֑וֹ וְהַחוּט֙ הַֽמְשֻׁלָּ֔שׁ לֹ֥א בִמְהֵרָ֖ה יִנָּתֵֽק׃
And if a man prevail against him that is alone, two shall withstand him; and a threefold cord is not quickly broken.
Read Jewish philosophical commentary on Ecclesiastes 4:12: and classical philosophical sources.