"acknowledged follower of Christ, was casting out devils in His name. The disciples forbade the man to work and thought they were right in doing this. But when they laid the matter before Christ, He reproved them, saying, “Forbid him not: for there is no man which shall do a miracle in My name, that can lightly speak evil of Me.” Mark 9:39 . None who showed themselves in any way friendly to Christ were to be repulsed. The disciples must not indulge a narrow, exclusive spirit, but must manifest the same far-reaching sympathy which they had seen in their Master. James and John had thought that in checking this man they had in view the Lord's honor; but they began to see that they were jealous for their own. They acknowledged their error and accepted the reproof. AA 543.3"
"But Jesus said, Forbid him not: for there is no man which shall do a miracle in my name, that can lightly speak evil of me."
Ellen White directly references Mark 9:39 in this passage.