Cross reference
John 4:35
35 Say not ye, There are yet four months, and then cometh harvest? behold, I say unto you, Lift up your eyes, and look on the fields; for they are white already to harvest.
Luke 10:2-3
2 Therefore said he unto them, The harvest truly is great, but the labourers are few: pray ye therefore the Lord of the harvest, that he would send forth labourers into his harvest.
3 Go your ways: behold, I send you forth as lambs among wolves.
Matthew 9:37-38
37 Then saith he unto his disciples, The harvest truly is plenteous, but the labourers are few;
38 Pray ye therefore the Lord of the harvest, that he will send forth labourers into his harvest.
John 4:30
30 Then they went out of the city, and came unto him.