וָאֶקַּח֙ אֶת־הַלְוִיִּ֔ם תַּ֥חַת כָּל־בְּכ֖וֹר בִּבְנֵ֥י יִשְׂרָאֵֽל׃
And I have taken the Levites instead of all the first-born among the children of Israel.
Find Talmudic references to Numbers 8:18: , passages from the Talmud Bavli and Yerushalmi.