30 Leaving that region, they traveled through Galilee. Jesus didn't want anyone to know he was there, 31 for he wanted to spend more time with his disciples and teach them. He said to them, "The Son of Man is going to be betrayed into the hands of his enemies. He will be killed, but three days later he will rise from the dead." 32 They didn't understand what he was saying, however, and they were afraid to ask him what he meant.
33 After they arrived at Capernaum and settled in a house, Jesus asked his disciples, "What were you discussing out on the road?" 34 But they didn't answer, because they had been arguing about which of them was the greatest. 35 He sat down, called the twelve disciples over to him, and said, "Whoever wants to be first must take last place and be the servant of everyone else." 36 Then he put a little child among them. Taking the child in his arms, he said to them, 37 "Anyone who welcomes a little child like this on my behalf welcomes me, and anyone who welcomes me welcomes not only me but also my Father who sent me."
38 John said to Jesus, "Teacher, we saw someone using your name to cast out demons, but we told him to stop because he wasn't in our group." 39 "Don't stop him!" Jesus said. "No one who performs a miracle in my name will soon be able to speak evil of me. 40 Anyone who is not against us is for us.
Matthew Henry's Commentary on Mark 9:30-40
Commentary on Mark 9:30-40
(Read Mark 9:30-40)
The time of Christ's suffering drew nigh. Had he been delivered into the hands of devils, and they had done this, it had not been so strange; but that men should thus shamefully treat the Son of man, who came to redeem and save them, is wonderful. Still observe that when Christ spake of his death, he always spake of his resurrection, which took the reproach of it from himself, and should have taken the grief of it from his disciples. Many remain ignorant because they are ashamed to inquire. Alas! that while the Saviour teaches so plainly the things which belong to his love and grace, men are so blinded that they understand not his sayings. We shall be called to account about our discourses, and to account for our disputes, especially about being greater than others. Those who are most humble and self-denying, most resemble Christ, and shall be most tenderly owned by him. This Jesus taught them by a sign; whoever shall receive one like this child, receives me. Many have been like the disciples, ready to silence men who have success in preaching to sinners repentance in Christ's name, because they follow not with them. Our Lord blamed the apostles, reminding them that he who wrought miracles in his name would not be likely to hurt his cause. If sinners are brought to repent, to believe in the Saviour, and to live sober, righteous, and godly lives, we then see that the Lord works by the preacher.