Mark 9:39
We know from Acts 19 and the story of the sons of Sceva that those who did not know the Lord would not be able to cast out demons. So, this man who the disciples had seen must have known the Lord. Likely he was a disciple of John who had now believed in Christ.
Heavenly Father, thank you for using us in the ministry. It is so nice to be involved in your work in this world. You know what is best, and you have given your children a big job to do. But you have given us what we need to do it. Thank you! In the name of the Lord Jesus Christ I pray and praise you, Amen.