Mark 3:15 means that Jesus gave the twelve disciples he had chosen a share in his own authority, so they could heal sickness and cast out demons. The verse describes one purpose of their calling: they were not only to be with Jesus, but to act with power on his behalf. It was spoken by Jesus, as the Gospel of Mark records it, to the group of followers he had gathered on a mountainside in Galilee.
And to have authority to heal sicknesses and to cast out demons…
Mark 3:15 (WEB)
What Mark 3:15 Means
The verse begins with “to have authority,” which tells you the disciples were given a delegated power, not one of their own. Jesus does not send them out to perform miracles on their own initiative. The authority comes from him and remains tied to him, which is why the early church understood its ministry as an extension of Christ’s work rather than a human project.
Next the verse names two areas of that power: healing “sicknesses” and casting out “demons.” The Gospels treat these as the visible front lines of God’s kingdom breaking into ordinary life. Bodies made whole and people freed from spiritual oppression were signs that God was active in the world.
The verse makes a specific claim but avoids a broader promise. It does not say every disciple would always heal every illness on demand, or that believers in any age would automatically share this gift in the same form. What it does show is that Jesus intended his followers to be active participants in his mission, carrying his compassion and power into real human need.
The Context of Mark 3:15
The Gospel of Mark is traditionally attributed to John Mark, a companion of Peter, and it was probably written for a Gentile audience, possibly in Rome. It is the shortest of the four Gospels and moves quickly from one scene to the next, emphasizing what Jesus does. Verse 15 sits inside a passage where Jesus, having drawn crowds seeking healing, withdraws to a mountain and calls the twelve to himself.
Just before verse 15, Jesus has told the crowds not to make him known, even as the unclean spirits recognize him. The verse that follows names the twelve, including Peter, James, and John, along with Simon the Zealot and others. Reading verse 15 in that setting shows that the authority is not granted to a religious elite but to ordinary men Jesus has deliberately chosen, which makes the commission both surprising and humbling.
Key Phrases in Mark 3:15
Matthew 10:1
He called to himself his twelve disciples, and gave them authority over unclean spirits, to cast them out, and to heal every disease and every sickness.
(WEB)
Matthew records the same commissioning of the twelve and states the authority over unclean spirits and every disease and sickness in the same breath. Reading it alongside Mark 3:15 shows how the Gospel writers agree that Jesus shared his power with his followers from the beginning of their mission.
Luke 9:1-2
1 He called the twelve together, and gave them power and authority over all demons, and to cure diseases. 2 He sent them out to preach God’s Kingdom and to heal the sick.
(WEB)
Luke describes the twelve receiving power and authority over demons and the ability to cure diseases, then being sent to proclaim the kingdom of God. This passage reinforces the link between authority, healing, and proclamation that Mark 3:15 presents as a single calling.
A Short Prayer From Mark 3:15
Lord Jesus, you chose ordinary people to share your work and gave them authority to heal and to drive out what harms. I confess that I often feel too small for the tasks you set before me. Remind me that the power comes from you and not from my own ability. Teach me to be with you first, so that whatever I do in your name flows from closeness to you. Where there is sickness or spiritual darkness around me, let your compassion move through my hands and words. Amen.
