Romans 10:14-15: "14 How then will they call on him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without someone preaching? 15 And how are they to preach unless they are sent? As it is written, 'How beautiful are the feet of those who preach the good news!'"
Matthew 28:18-20: "18 And Jesus came and said to them, 'All authority in heaven and on earth has been given to me, 19 Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, 20 teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age.'"
Isaiah 6:5-8: "5 And I said: 'Woe is me! For I am lost; for I am a man of unclean lips, and I dwell in the midst of a people of unclean lips; for my eyes have seen the King, the LORD of hosts!'
"6 Then one of the seraphim flew to me, having in his hand a burning coal that he had taken with tongs from the altar. 7 And he touched my mouth and said: 'Behold, this has touched your lips; your guilty is taken away, and your sin atoned for.'
"8 And I heard the voice of the Lord saying, 'Whom shall I send, and who will go for us?' Then I said, 'Here am I! Send me.'"
Acts 4:29-31: "29 'And now, Lord, look upon their threats and grant to your servants to continue to speak your word with all boldness, 30 while you stretch out your hand to heal, and signs and wonders are performed through the name of your holy servant Jesus.' 31 And when they had prayed, the place in which they were gathered together was shaken, and they were all filled with the Holy Spirit and continued to speak the word of God with boldness."
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The passage from Romans 10 appears in the first verse, particularly the first line ("'How shall they hear,' who have not heard"), and it's referred to again in the fifth verse ("So shall they hear and find and prove / Christ is their life, their joy, their crown").
Matthew 28:18-20, especially verse 19, is alluded to in the second verse ("'To all the world,' to ev'ry place... Preach the good news").
Isaiah 6:5-8 is the basis for the third and fourth verses and appears most clearly at the beginning of each ("'Whom shall I send?'" and "'Lord, here am I'"). The burning coal touching Isaiah's lips is also alluded to in the fourth verse: "Your fire impart... Touch but my lips."
The passage from Acts 4 seems to be referred to in the fifth verse, especially the first two lines: "Spirit of love, within us move: / Spirit of truth, in pow'r come down!"
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The line "Neighbors and friends and far-off lands" in the second verse exhibits polysyndeton (the repeated "and"), and this provides a sense of the entirety of "all the world" and "ev'ry place" from the preceding line.
