Read Mark 1:29-39
29 Jesus and his disciples, including James and John, left the synagogue and went straight to the home of Simon and Andrew. 30Simon’s mother-in-law was sick in bed with a fever, and as soon as Jesus arrived, he was told about her. 31He went to her, took her by the hand, and helped her up. The fever left her, and she began to wait on them.
32 After the sun had set and evening had come, people brought to Jesus all the sick and those who had demons. 33All the people of the town gathered in front of the house. 34Jesus healed many who were sick with all kinds of diseases and drove out many demons. He would not let the demons say anything, because they knew who he was.
35 Very early the next morning, long before daylight, Jesus got up and left the house. He went out of the town to a lonely place, where he prayed. 36But Simon and his companions went out searching for him, 37and when they found him, they said, “Everyone is looking for you.”
38 But Jesus answered, “We must go on to the other villages round here. I have to preach in them also, because that is why I came.” 39So he travelled all over Galilee, preaching in the synagogues and driving out demons.
In verse 38 Jesus tells us what he came to do, preach. The message that he preached was the news of God's Kingdom.