'Feed My Lambs' in the Bible

So, after they had eaten, Jesus said to Simon Peter, "Simon, son of John, do you really love me more than these [other disciples do]?" Peter answered Him, "Yes, Lord, you know that I love you." [Note: Since two different Greek words for "love" are used in this conversation, some scholars see a distinction in their meaning. See Butler, Vol. II, pp. 453-457 for a discussion of these views]. Jesus replied to him, "[Then] feed my lambs."