tn The text simply has “evening, and you will know.” Gesenius notes that the perfect tense with the vav consecutive occurs as the apodosis to temporal clauses or their equivalents. Here the first word implies the idea “[when it becomes] evening” or simply “[in the] evening” (GKC 337–38 §112.oo).

sn Moses is very careful to make sure that they know it is Yahweh who has brought them out, and it will be Yahweh who will feed them. They are going to be convinced of this now.