“I haue heard the murmurings of the children of Israel: Speake vnto them, saying, At euen ye shall eat flesh, and in the morning ye shalbe filled with bread: and ye shal know that I am the Lord your God.”
1611 King James Version (KJV)
16:12 And ye shall know that I am the Lord your God - This gave proof of his power as the Lord, and his particular favour to them as their God; when God plagued the Egyptians, it was to make them know that he is the Lord; when he provided for the Israelites, it was to make them know that he was their God.