'Drink Offering' in the Bible

So the three elite warriors broke through the Philistine forces and drew some water from the cistern in Bethlehem near the city gate. They carried it back to David, but David refused to drink it. He poured it out as a drink offering to the Lord

The next day they made sacrifices and offered burnt sacrifices to the Lord (1,000 bulls, 1,000 rams, 1,000 lambs), along with their accompanying drink offerings and many other sacrifices for all Israel.