The harvest is the lost souls, the labourers are those who have accepted the word; since the followers who have the task of winning over these lost souls are less than the unbelievers Jesus asked his followers to pray for the labourers in order for them to win more souls and not to fall into temptation.

We are experiencing this in these end times many men of God have fallen into temptation.  The notion is that since they are men of God they do not need to be prayed for rather they should be doing the praying for the members and this is wrong.  Men of God need the prayers of the congregation too so as to continue with the propagation of the gospel without falling into temptation.