1 Samuel 3:10 in the King James Version
And the LORD came, and stood, and called as at other times, Samuel, Samuel. Then Samuel answered, Speak; for thy servant heareth.
Context
9 Therefore Eli said to Samuel, “Go, lie down. It shall be, if he calls you, that you shall say, ‘Speak, LORD; for your servant hears.’” So Samuel went and lay down in his place.
10 The LORD came, and stood, and called as at other times, “Samuel! Samuel!” Then Samuel said, “Speak; for your servant hears.”
11 The LORD said to Samuel, “Behold, I will do a thing in Israel at which both the ears of everyone who hears it will tingle.