Judges 13:15-16

And Manoah said unto the angel of the LORD, I pray thee, let us detain thee, until we shall have made ready a kid for thee. And the angel of the LORD said unto Manoah, Though thou detain me, I will not eat of thy bread: and if thou wilt offer a burnt offering, thou must offer it unto the LORD. For Manoah knew not that he was an angel of the LORD.