וְהַ֨לְוִיִּ֔ם לֹ֣א הָתְפָּקְד֔וּ בְּת֖וֹךְ בְּנֵ֣י יִשְׂרָאֵ֑ל כַּאֲשֶׁ֛ר צִוָּ֥ה יְהוָ֖ה אֶת־מֹשֶֽׁה׃
레위인은 이스라엘 자손과 함께 계수되지 아니하였으니 여호와께서 모세에게 명하심과 같았느니라
Rashi
But Levi and Benjamin he did not count among them, etc. Joab knew that it would be considered a sin for the people, leading to a plague; Joab therefore said, “I can save these tribes from the census. Concerning Levi, if David says: ‘Why did you not count Levi?’ I shall answer him that they were not counted among the Children of Israel (Num. 2:33). And this is what I shall say about Benjamin: ‘Weren’t they stricken in the episode of the concubine in Gibeah? If they are afflicted now, what will be left of them?’”
Or HaChaim
והלוים…לא התפקדו בתוכם, and the Levites…were not numbered among them. I have explained this in connection with verse 2.