Midrasch zu Schemuel I 9:15

Another explanation of Then He opened the ears of man: This alludes to Samuel, as is said: Now the Lord had revealed unto Samuel a day before Saul came, saying: Tomorrow about this time I will send thee a man out of the land of Benjamin, and thou shalt anoint him to be prince over My people Israel (I Sam. 9:15–16). After Samuel set out to anoint David, he encountered Eliab, and he said to himself: Surely the Lord’s anointed is before Him. But the Lord said unto Samuel: “Look not on his countenance nor on the height of his stature, for I have rejected him” (ibid. 16:7). When David approached, the Holy One, blessed be He, said to Samuel: Arise, anoint him; for this is he (ibid., v. 12); that is, the Holy One, blessed be He, said to him: Shall My anointed stand while you sit? Arise, anoint him.