'One Who Sent Me' in the Bible

Then Gad came to David, and he told him and said to him, "Shall seven years of famine in the land come to you? Or three months of your fleeing from your enemies while he [is] pursuing you? Or should there be three days of pestilence in your land? Now consider and decide what I must return to the one who sent me a word."

three years of famine, or three months of devastation by your foes with the sword of your enemy overtaking you, or three days of the sword of the Lord—a plague on the land, the angel of the Lord bringing destruction to the whole territory of Israel.’ Now decide what answer I should take back to the One who sent me.”