Exodus 16:7-8

7and in the morning you will see the glory of the Lord, because he has heard your grumbling against him. Who are we, that you should grumble against us?”

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.”