38 Now John answered Him, saying, “Teacher, we saw someone who does not follow us casting out demons in Your name, and we forbade him because he does not follow us.” 39 But Jesus said, “Do not forbid him, for no one who works a miracle in My name can soon afterward speak evil of Me. 40 For he who is not against us is on our side. (Mark 9:38–40, NKJV)
The twelve apostles often squabbled among themselves over who was the greatest in the kingdom. It is easy to see how they would discount and try to forbid someone who was not of their immediate circle, even when the evidence of heaven’s approval was staring them in the face. Jesus acknowledged this person was casting out demons in His name (v. 39). John and his fellow apostles were zealous of their positions, which led them to reject someone who was faithfully working in Christ’s name. (Note, John did not say, “He does not follow You,” but rather, “he does not follow us.”) Zeal for their own positions was greater than their zeal for the Lord. This passage does not endorse unity in doctrinal diversity. (The man and the apostles were all working in the name of Christ.) Instead, it urges unity among those who faithfully follow Christ because they all work in His name (do His will by His authority, Colossians 3:17). We act with the Lord’s authority to glorify Christ, not ourselves. Another person doing the will of Christ will also be blessed (Mark 9:41). That person deserves to be accepted, not rejected as separate from us (Mark 9:38-39).