Matthew 10:42

42Andκαὶwhoeverὃς*ἂνshall give to drinkποτίσῃoneἕναtheτῶνlittle onesμικρῶνof theseτούτωνa cupποτήριονof cold [water]ψυχροῦonlyμόνονin [the]εἰςnameὄνομαof a discipleμαθητοῦ,trulyἀμὴνI sayλέγωto youὑμῖν,noοὐnotμὴshall he loseἀπολέσῃtheτὸνrewardμισθὸνof himαὐτοῦ.

And whoever shall give to drink to one of these little ones merely a cup of cold [water] in the name of a disciple, truly I say to you⁺, he shall certainly not lose his reward.”