Exodus 16:8-9

8Moses also said, “You will know that it was the Lord when he gives you meat to eat in the evening and all the bread you want in the morning, because he has heard your grumbling against him. Who are we? You are not grumbling against us, but against the Lord.”

9Then Moses told Aaron, “Say to the entire Israelite community, ‘Come before the Lord, for he has heard your grumbling.’ ”