Jesus told them that he had to preach in other towns.

Luke 4:42-44

42 Early the next morning Jesus left that house and went to an uninhabited place to pray. Many people searched for him, and when they found him they kept urging him not to leave them. 43 But he said to them, “I must tell people in other towns also the good message about how God wants to rule [MET] their lives, because that is what I was sent {God sent me} to do.” 44 So he kept preaching in ◄the synagogues/Jewish worship places► in various towns in Judea province.