Jamieson, Fausset and Brown on Mark 9:38

38. And John answered him, saying, Master, we saw one casting out devils in thy name, and he followeth not us: and we forbade him, because he followeth not us--The link of connection here with the foregoing context lies, we apprehend, in the emphatic words which our Lord had just uttered, "in My name." "Oh," interposes John--young, warm, but not sufficiently apprehending Christ's teaching in these matters--"that reminds me of something that we have just done, and we should like to know if we did right. We saw one casting out devils "in Thy name," and we forbade him, because he followeth not us. Were we right, or were we wrong?" Answer--"Ye were wrong." "But we did it because he followeth not us." "No matter."