Targum for Numbers 1:53

וְהַלְוִיִּ֞ם יַחֲנ֤וּ סָבִיב֙ לְמִשְׁכַּ֣ן הָעֵדֻ֔ת וְלֹֽא־יִהְיֶ֣ה קֶ֔צֶף עַל־עֲדַ֖ת בְּנֵ֣י יִשְׂרָאֵ֑ל וְשָׁמְרוּ֙ הַלְוִיִּ֔ם אֶת־מִשְׁמֶ֖רֶת מִשְׁכַּ֥ן הָעֵדֽוּת׃

But the Levites shall pitch round about the tabernacle of the testimony, that there be no wrath upon the congregation of the children of Israel; and the Levites shall keep the charge of the tabernacle of the testimony.’

Targum Jonathan on Numbers