Contemporary English Version
But Jesus said, "People in other towns must hear the good news about God's kingdom. This is why I was sent."

Douay-Rheims Bible
To whom he said: To other cities also I must preach the kingdom of God: for therefore am I sent.

To whom he said: To other cities also I must preach the kingdom of God: for therefore am I sent.

I must.

Mark 1:14,15,38,39 And after that John was delivered up, Jesus came in Galilee, preaching the gospel of the kingdom of God, . . .

John 9:4 I must work the works of him that sent me, whilst it is day: the night cometh, when no man can work.

Acts 10:38 Jesus of Nazareth: how God anointed him with the Holy Ghost and with power, who went about doing good and healing all that were oppressed by the devil, for God was with him.

2 Timothy 4:2 Preach the word: be instant in season, out of season: reprove, entreat, rebuke in all patience and doctrine.

therefore.

Isaiah 42:1-4 Behold my servant, I will uphold him: my elect, my soul delighteth in him: I have given my spirit upon him, he shall bring forth judgment to the Gentiles. . . .

Isaiah 48:16 Come ye near unto me, and hear this: I have not spoken in secret from the beginning: from the time before it was done, I was there, and now the Lord God hath sent me, and his spirit.

Isaiah 61:1-3 The spirit of the Lord is upon me, because the Lord hath anointed me: he hath sent me to preach to the meek, to heal the contrite of heart, and to preach a release to the captives, and deliverance to them that are shut up. . . .

John 6:38-40 Because I came down from heaven, not to do my own will but the will of him that sent me. . . .

John 20:21 He said therefore to them again: Peace be to you. As the Father hath sent me, I also send you.