CHRYSOSTOM . A prophet’s reward, and a righteous man’s reward, are such rewards as it is fitting he should have who entertains a prophet, or a righteous man: or, such a reward as a prophet or righteous man should have.
GREGORY . (Hom. in Ev. xx. 12.) He says not, a reward from a prophet, or righteous man, but the reward of a prophet or righteous man. For the prophet is perhaps a righteous man, and the less he possesses in this world, the greater confidence has he in speaking in behalf of righteousness. He who hath of this world’s goods, in supporting such a man, makes himself a free partaker in his righteousness, and shall receive the reward of righteousness together with him whom he has aided by supporting him. He is full of the spirit of prophecy, but he lacks bodily sustenance, and if the body be not supported, it is certain that the voice will fail. Whoso then gives a prophet food, gives him strength for speaking, therefore together with the prophet he shall receive the prophet’s reward, when he shews before the face of God what bounty he shewed him.
JEROME . Mystically; He who receives a prophet as a prophet, and understands him speaking of things to come, he shall receive reward of that prophet. The Jews therefore, who understand the prophets carnally, do not receive the prophet’s reward.
REMIGIUS . Some understand by the prophet here, the Lord Jesus Christ, of whom Moses says, A Prophet shall the Lord your God raise up unto you; (Deut. 18:18.) and the same also by the righteous man, because he is beyond comparison righteous. He then who shall receive a prophet or righteous man in the name of the prophet or righteous man, i. e. of Christ, shall receive reward from Him for love of whom he received Him.
JEROME . That none should say, I am poor and therefore cannot be hospitable, He takes away even this plea by the instance of a cup of cold water, given with good will. He says cold water, because in hot, poverty and lack of fuel might be pleaded. And whosoever shall give to drink to one of the least of these a cup of cold water only in the name of a disciple, verily I say unto you, he shall not lose his reward.
REMIGIUS . The least of these, that is, not a prophet, or a righteous man, but one of these least.
GLOSS . (non occ.) Note, that God looks more to the pious mind of the giver, than to the abundance of the thing given.
GLOSS . (ord.) Or, the least are they who have nothing at all in this world, and shall be judges with Christ.
HILARY . Or; Seeing beforehand that there would be many who would only glory in the name of Apostleship, but in their whole life and walk would be unworthy of it, He does not therefore deprive of its reward that service which might be rendered to them in belief of their religious life. For though they were the very least, that is, the greatest of sinners, yet even small offices of mercy shewn them, such as are denoted by the cup of cold water, should not be shewn in vain. For the honour is not done to a man that is a sinner, but to his title of disciple.