Adam Clarke on 1 Thessalonians 5:25

Pray for me - Even apostles, while acting under an extraordinary mission, and enjoying the inspiration of the Holy Ghost, felt the necessity of the prayers of the faithful. God requires that his people should pray for his ministers; and it is not to be wondered at, if they who pray not for their preachers should receive no benefit from their teaching. How can they expect God to send a message by him, for whom they, who are the most interested, have not prayed? If the grace and Spirit of Christ be not worth the most earnest prayers which a man can offer, they, and the heaven to which they lead, are not worth having.