Sefer HaMitzvot, Negative Commandments
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הזהירנו מעזוב הלוים והעלם מהם בנתינת חקיהם ושמחם ברגל. והוא אמרו השמר לך פן תעזוב את הלוי, לא תעשה. (ראה אנכי נותן, הלכות חגיגה פ"ב הי"ד):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited us from abandoning and ignoring the Levites, regarding the giving of their due and gladdening them on the festival. And His saying, "Guard yourself, lest you forsake the Levite" (Deuteronomy 12:19), is a negative commandment. (See Parashat Re'eh; Mishneh Torah, Festival Offering 3.)