Another interpretation: "For you will light my lamp." In the troops of Amalek. Rabbi Yehoshua ben Levi said: A great legion of Amalek came to David, and David fought with them for two nights and one day, as it says, "And David struck them from twilight until evening the next day" (1 Samuel 30:17). And who illuminated for him on those nights? Rabbi Yehoshua ben Levi said, "The Holy One, blessed be He, illuminated for him." Therefore it is written, "For you will light my lamp." Bar Kappara said: The Holy One, blessed be He, said to him, "My lamp is in your hand, and your lamp is in My hand. If you light my lamp, meaning if you keep my commandments, I will keep yours," etc. (Psalm 16:2).