After traveling, preaching and performing miracles for about two years in the land of Israel, Jesus began teaching his apostles to do the same, to prepare them for evangelizing to people in other nations. In doing so, he miraculously bestows upon them the ability to perform miracles.
As explained in the Gospel of Matthew:
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. 2 Now the names of the twelve apostles are these. The first, Simon, who is called Peter; Andrew, his brother; James the son of Zebedee; John, his brother; 3 Philip; Bartholomew; Thomas; Matthew the tax collector; James the son of Alphaeus; Lebbaeus, who was also called Thaddaeus; 4 Simon the Zealot; and Judas Iscariot, who also betrayed him.
5 Jesus sent these twelve out and commanded them, saying, “Don’t go among the Gentiles, and don’t enter into any city of the Samaritans. 6 Rather, go to the lost sheep of the house of Israel. 7 As you go, preach, saying, ‘The Kingdom of Heaven is at hand!’ 8 Heal the sick, cleanse the lepers, and cast out demons. Freely you received, so freely give. (Matthew 10:1-8, WEB)
Near the end of his public ministry, which lasted about three-and-a-half years, Jesus again bestowed miraculous powers upon his apostles (Luke 10:1-17). The apostles would later use this training, after the ascension of Jesus, to evangelize Christianity throughout the Roman world, as explained throughout the New Testament book of Acts.
Read more in the book Jesus the Miracle Worker: The 50 miracles of Jesus explained in chronological order (The Jesus Series) -- now available at amazon.
Next: 26. Healing of many in Bethsaida (Matthew 14:13-14 and Luke 9:10-11)