1 Samuel 3:2, 7, 9

One night Eli, whose eyes were becoming so weak that he could barely see, was lying down in his usual place.

Now Samuel did not yet know the LORD: The word of the LORD had not yet been revealed to him.

So Eli told Samuel, “Go and lie down, and if he calls you, say, ‘Speak, LORD, for your servant is listening.’ ” So Samuel went and lay down in his place.