'In the Name of the Lord' in the Bible

Then said David to the Philistine, "Thou comest to me with a sword, a spear, and a shield: But I come to thee in the name of the LORD of Hosts, the God of the host of Israel whom thou hast railed upon.

And Jonathan said unto David, "Go thy way in peace. Whatsoever we both have sworn and spoken together in the name of the LORD, the LORD be witness between me and thee, and between my seed and thine forever." And Jonathan gat him up, and came into the city.