Wonder where he found that in Scripture?
The closest thing I can find is,
James 5:4
“Behold, the wages of the laborers who mowed your fields, which you kept back by fraud, are crying out against you, and the cries of the harvesters have reached the ears of the Lord of hosts.”
But I don’t know of any verse that claims the laborers must be paid after the harvest has ended and the work is done.