Numbers 4:18 Kabbalah

אַל־תַּכְרִ֕יתוּ אֶת־שֵׁ֖בֶט מִשְׁפְּחֹ֣ת הַקְּהָתִ֑י מִתּ֖וֹךְ הַלְוִיִּֽם׃

’Cut ye not off the tribe of the families of the Kohathites from among the Levites;