Reference for Numbers 3:23

מִשְׁפְּחֹ֖ת הַגֵּרְשֻׁנִּ֑י אַחֲרֵ֧י הַמִּשְׁכָּ֛ן יַחֲנ֖וּ יָֽמָּה׃

The families of the Gershonites were to pitch behind the tabernacle westward;

BDB

BDB