1 Samuel 3:8

But Eli was neither so inexperienced, nor so lost to all sense of Jehovah being the immediate ruler of Israel, as not to perceive, when Samuel came to him the third time, that the matter was Divine. Possibly he recalled to mind the visit of the man of God, and had some presage of what the message might be. At all events he bade Samuel lie calmly down again, because the best preparation for hearing God's voice is obedience and trustful submission.