שִׁ֥יר הַֽמַּעֲל֗וֹת לְדָ֫וִ֥ד הִנֵּ֣ה מַה־טּ֭וֹב וּמַה־נָּעִ֑ים שֶׁ֖בֶת אַחִ֣ים גַּם־יָֽחַד׃
A Song of Ascents; of David. Behold, how good and how pleasant it is For brethren to dwell together in unity!
Read Jewish philosophical commentary on Psalms 133:1: and classical philosophical sources.