Matthew 4:23
Jesus went all over Galilee teaching in the [Jewish] synagogues and preaching the good news of the [coming, see verse 17] kingdom, and healing all kinds of disease and sickness among the people.
Mark 4:2
He taught the people many things using parables [to illustrate His lessons]. In His teaching He said to them,
Luke 4:43-44
But He told them, "I must go to other towns also to preach the good news of God's [coming] kingdom, for this is why I was sent [by God]."
Acts 1:1
[Dear] Theophilus, in my former letter [i.e., the Gospel of Luke] I wrote to you concerning what all Jesus did and taught since the beginning [of His ministry],