TgO Lev20:23 :וְלָא תְהָכוּן בְנִמוֹסֵי עַמְמַיָא‏ : you must not practice the customs of the gentiles
See the entire entry for nāmōs [nēmōs, nōmōs], nāmōsā, etc.̣ n.m. law; custom