1 Samuel 3:9

And he said: "Here I am. For you called me." Then Eli understood that the Lord had called the boy. And he said to Samuel: "Go and sleep. And if he calls to you from now on, you will say, ‘Speak, Lord, for your servant is listening.’ " Therefore, Samuel went away, and he slept in his place

Other versions

King James Version

Therefore Eli said unto Samuel, Go, lie down: and it shall be, if he call thee, that thou shalt say, Speak, LORD; for thy servant heareth. So Samuel went and lay down in his place.

English Standard Version

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.

New International Version

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.