"who took you out from the land of Egypt": They were servants of kings. You say, they were servants of kings, but perhaps they were servants of servants. (Devarim 7:8) "And he redeemed you from the house of servants, from the hand of Pharaoh, the king of Egypt," makes it clear that they were servants of kings and not servants of servants. Variantly: ("from the house of servants":) from the house of the servants of idolatry.