מדרש על ויקרא 8:27

29) (Vayikra 8:27) ("and he waved them as a wave offering before the L–rd."): We are hereby taught (the procedure for) the waving of the offerings. (Vayikra 8:28): "And Moses took them from their hands": We are hereby taught how he takes the meal-offering from the hands of the sotah and waves it.