Reference for Joshua 22:34

וַֽיִּקְרְא֛וּ בְּנֵי־רְאוּבֵ֥ן וּבְנֵי־גָ֖ד לַמִּזְבֵּ֑חַ כִּ֣י עֵ֥ד הוּא֙ בֵּֽינֹתֵ֔ינוּ כִּ֥י יְהוָ֖ה הָאֱלֹהִֽים׃ (פ)

And the children of Reuben and the children of Gad called the altar—: ‘for it is a witness between us that the LORD is God.’