Luke 4:43

And He said to them, That, it behooveth me to preach the gospel of the kingdom of God to many other cities: because unto this I have been sent.

Mark 1:14-15

After that John was cast into prison, Jesus came into Galilee preaching the gospel of the kingdom of God,

Mark 1:38-39

And He says to them, Let us go into the surrounding villages and cities, that I may preach there; for unto this I have come out.

John 6:38-40

Because I have come down from heaven, not that I may do my own will, but the will of Him that sent me.

John 9:4

It behooveth us to work the works of Him that sent us, while it is day: the night comes, when no one is able to work.

John 20:21

And Jesus said to them again, Peace be unto you: as the Father hath sent me, I also send you.

Acts 10:38

Jesus, the one from Nazareth, how God anointed Him with the Holy Ghost and power: who went about doing good, and healing all oppressed by the devil: because God is with Him.

2 Timothy 4:2

preach the word: be instant in season and out of season; convict, exhort, rebuke, with all longsuffering and teaching.

Treasury of Scripture Knowledge

Summary

And he said unto them, I must preach the kingdom of God to other cities also: for therefore am I sent.

Therefore

General references

Bible References

I must

Mark 1:14
After that John was cast into prison, Jesus came into Galilee preaching the gospel of the kingdom of God,
John 9:4
It behooveth us to work the works of Him that sent us, while it is day: the night comes, when no one is able to work.
Acts 10:38
Jesus, the one from Nazareth, how God anointed Him with the Holy Ghost and power: who went about doing good, and healing all oppressed by the devil: because God is with Him.
2 Timothy 4:2
preach the word: be instant in season and out of season; convict, exhort, rebuke, with all longsuffering and teaching.

Therefore

John 6:38
Because I have come down from heaven, not that I may do my own will, but the will of Him that sent me.
John 20:21
And Jesus said to them again, Peace be unto you: as the Father hath sent me, I also send you.

General references

Matthew 9:35
And Jesus was going around all the cities and villages, teaching in their synagogues, and preaching the gospel of the kingdom, and healing every disease and ailment.