1 Samuel 3:2, 7, 9

At that time Eli, whose eyesight had begun to grow dim so that he could not see, was lying down in his own place.

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

Therefore Eli said to Samuel, “Go, lie down, and if he calls you, you shall say, ‘Speak, LORD, for your servant hears.’” So Samuel went and lay down in his place.