Matthew
Matthew 6:4ESV·traditional attribution

so that your giving may be in secret. And your Father who sees in secret will reward you.

John Calvin Reformed @genevareformer

4. That thy alms may be in secret This statement appears to be opposed to many passages of Scripture, in which we are commanded to edify the brethren by good examples. But if we attend to the design of Christ, we must not give a more extensive meaning to the words.

Matthew Henry Presbyterian @wholebiblehenry

As we must do better than the scribes and Pharisees in avoiding heart-sins, heart-adultery, and heart-murder, so likewise in maintaining and keeping up heart-religion, doing what we do from an inward, vital principle, that we may be approved of God, not that we may be applauded of men; that is, we must watch against hypocrisy, which was the leaven of the Pharisees, as well as against their doctrine, Luk 12:1.

Commenting on Matthew 6:1-4

John Gill Reformed Baptist @doctorgill

That thine alms may be in secret,.... May be done in secret, and be kept a secret. The allusion seems to be to the secret chamber, where money was brought privately for the relief of the poor. "There were two chambers in the sanctuary, the one was , "the chamber of secrets", and the other the chamber of vessels: the chamber of secrets was that...