'Name of the Lord' in the Bible

David said to the Philistine: “You come against me with a dagger, spear, and sword, but I come against you in the name of Yahweh of Hosts, the God of Israel’s armies—you have defied Him.

Jonathan then said to David, “Go in the assurance the two of us pledged in the name of the Lord when we said: The Lord will be a witness between you and me and between my offspring and your offspring forever.” Then David left, and Jonathan went into the city.