'Burnt offering' in the Bible

then whatever comes out of the doors of my house to meet me when I return in peace from the Ammonites, it shall be the Lord’s, and I will offer it up as a burnt offering.”

The Angel of the Lord said to Manoah, “Though you detain me, I will not eat your food, but if you prepare a burnt offering, offer it to the Lord.” For Manoah did not know that he was the Angel of the Lord.

But his [sensible] wife said to him, “If the Lord had desired to kill us, He would not have received a burnt offering and a grain offering from our hands, nor would He have shown us all these things, nor would He have announced such things as these at this time.”