How do we know that Jesus has authority over sickness?

The authoritative command of Jesus is evident throughout the Gospels, where He speaks to sickness and it obeys Him. In Mark 1:27, even the unclean spirits recognize His authority, and subsequently, He heals Peter's mother-in-law by merely taking her by the hand (Mark 1:31). This suggests that His power is not dependent on human intervention but is solely anchored in His divine nature. As He commands sickness to leave, it emphasizes that He is not only a healer but also Lord over all creation, which includes the forces of physical maladies.