(41) Whosoever shall give you a cup of water.--See Note on Matthew 10:42. The reproduction of the promise in so different a context is significant as an instance of our Lord's method of teaching, reiterating words of blessing and of wisdom till they were engraved indelibly on the minds of those who heard them.

Verse 41. - In my name, because ye belong to Christ. The reading adopted in the Revised Version is, ἐν ὀνόματι ὅτι χριστοῦ ἐστέ: literally, in name, that ye are Christ's; or, because ye are Christ's. The force of this observation seems to be this: "If he who gives you a cup of water to drink in my Name, and out of regard for me, does well, and shall be rewarded of God, much more shall he be rewarded who casts out devils in my Name." The disciples are thus taught that it is contrary to the whole spirit of Christianity to disparage works of beneficence, or to suggest unworthy motives for them (see 'Speaker's Commentary,' in loc.).

9:41-50 It is repeatedly said of the wicked, Their worm dieth not, as well as, The fire is never quenched. Doubtless, remorse of conscience and keen self-reflection are this never-dying worm. Surely it is beyond compare better to undergo all possible pain, hardship, and self-denial here, and to be happy for ever hereafter, than to enjoy all kinds of worldly pleasure for a season, and to be miserable for ever. Like the sacrifices, we must be salted with salt; our corrupt affections must be subdued and mortified by the Holy Spirit. Those that have the salt of grace, must show they have a living principle of grace in their hearts, which works out corrupt dispositions in the soul that would offend God, or our own consciences.For whosoever shall give you a cup of water to drink,.... Not only one that does a miracle in the name of Christ, but he that shows the least respect, or does the least kindness to any one of his; See Gill on Matthew 10:42; is to be reckoned a friend, and is so accounted by Christ; and will be sooner or later taken notice of by him, especially, if what he does, be it ever so little, is done on his account:

in my name, because ye belong to Christ; or as the Syriac version renders it, "on account that ye are Christ's"; are his disciples, are called by his name, are partakers of his grace, bear his image and likeness, are loved by him, interested in him, given to him, redeemed by him called by his grace, and shall be with him:

verily l say unto you, he shall not lose his reward; See Gill on Matthew 10:42.