John Wesley on 1 Samuel 16:6

Before him - That is, in this place where God is now present. For it is observable, that not only the sacrifice is said to be offered, but even the feast upon the remainders of it is said, to be eaten before the Lord, Deut 12:7, that is, before or near his altar, where God was present in a special manner. This I take to be the person I am sent to anoint: wherein yet be was mistaken, as other prophets sometimes were, when they hastily spake their own thoughts, before they had consulted God.