Isaiah 6:8: "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.'"
Isaiah 55:10-11: "10 'For as the rain and the snow come down from heaven and do not return there but water the earth, making it bring forth and sprout, giving seed to the sower and bread to the eater, 11 so shall my word be that goes out from my mouth; it shall not return to me empty, but it shall accomplish that which I purpose, and shall succeed in the thing for which I sent it.'"
Luke 10:2: "And he said to them, 'The harvest is plentiful, but the laborers are few. Therefore pray earnestly to the Lord of the harvest to send out laborers into his harvest.'"
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Only the first stanza is public domain:
Hark, the voice of Jesus calling,"Who will go and work today?Fields are white and harvests waiting -Who will bear the sheaves away?"Loud and long the Master calleth;Rich reward He offers thee.Who will answer, gladly saying,"Here am I, send me, send me"?
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The first verse is almost the same as the first verse of "Hark, the Voice of Jesus Crying" (LSB #826), so my comments on it are basically the same, too:
Isaiah 6:8 appears in the first verse ("Hark, the voice of Jesus calling, / 'Who will go and work today?'... 'Here am I, send me, send me'").The harvest imagery in Luke 10:2 [LSB #826 also cites Matthew 9:37-38] is used in the lines "'Fields are white and harvests waiting - / Who will bear the sheaves away?'" in the first verse, although these lines also borrow from John 4:35: "'Do you not say, "There are yet four months, then comes the harvest"? Look, I tell you, lift up your eyes, and see that the fields are white for harvest.'"
Isaiah 55:10-11 is paraphrased in the third verse.
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The second verse paraphrases the Parable of the Laborers in the Vineyard (Matthew 20:1-16).
In the fourth verse, the lines "When with His angelic reapers / He in glory shall descend" borrow imagery from the explanation of the Parable of the Weeds in Matthew 13, specifically part of verse 39: '''The harvest is the close of the age, and the reapers are angels.'" The lines "Soon the night, the final harvest; / Soon the time for work shall cease" may borrow from John 9:4: "'We must work the works of him who sent me while it is day; night is coming, when no one can work.'"
