John 21:15-17

15 So when they had dined, Jesus saith to Simon Peter, Simon [son] of Jonas, lovest thou me more than these? He saith to him, Yes, Lord: thou knowest that I love thee. He saith to him, Feed my lambs.

16 He saith to him again the second time, Simon [son] of Jonas, lovest thou me? He saith to him, Yes, Lord: thou knowest that I love thee. He saith to him, Feed my sheep.

17 He saith to him the third time, Simon [son] of Jonas, lovest thou me? Peter was grieved, because he said to him the third time, Lovest thou me? And he said to him, Lord, thou knowest all things; thou knowest that I love thee. Jesus saith to him, Feed my sheep.