40 “Whoever welcomes you welcomes me; and whoever welcomes me welcomes the one who sent me. 41Whoever welcomes God’s messenger because he is God’s messenger, will share in his reward. And whoever welcomes a good man because he is good, will share in his reward. 42You can be sure that whoever gives even a drink of cold water to one of the least of these my followers because he is my follower, will certainly receive a reward.”
Jesus invites us to support those who do good; and so to share in their reward. To support them by welcoming them, by doing as little as giving them a drink of cold water. Considering the verses preceding these - those who work for the Kingdom of God are bound to be having a hard time. Any little bit of encouragement helps.
Lord when I have struggled you have sent angels to help me. When others struggle, use me as your messenger.