Albert Barnes on 1 Thessalonians 5:25

Brethren pray for us. A request which the apostle often makes. Heb 13:18. He was a man of like passions as others; liable to the same temptations; engaged in an arduous work; often called to meet with opposition, and exposed to peril and want, and he peculiarly needed the prayers of the people of God. A minister, surrounded as he is by temptations, is in great danger if he has not the prayers of his people. Without those prayers, he will be likely to accomplish little in the cause of his Master. His own devotions in the sanctuary will be formal and frigid, and the word which he preaches will be likely to come from a cold and heavy heart, and to fall also on cold and heavy hearts. There is no way in which a people can better advance the cause of piety in their own hearts, than by praying much for their minister.