Bible Verses About Missionary Work By Ministers: Required

And he said unto them, The harvest indeed is plenteous, but the laborers are few: pray ye therefore the Lord of the harvest, that he send forth laborers into his harvest.

How then shall they call on him in whom they have not believed? and how shall they believe in him whom they have not heard? and how shall they hear without a preacher?

and how shall they preach, except they be sent? even as it is written, How beautiful are the feet of them that bring glad tidings of good things!