Matthew 6:4

“That thine alms may be in secret, etc.] 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 µyaçj tkçl, “the chamber of secrets”, and the other the chamber of vessels: the chamber of secrets was that into which pious persons put yaçjb, “in secret”, and the poor children of good men were maintained out of it privately f381.” The Jews say many things in favour of doing alms privately. “Greater, (say they f382,) is he that gives alms rtsb, in secret, than Moses our master.” They tell us f383, that “R. Jannai seeing a certain man give Zuz…”

“That thine alms may be in secret, and thy Father which seeth in secret himself shall reward thee openly--The word "Himself" appears to be an unauthorized addition to the text, which the sense no doubt suggested. (See Ti1 5:25; Rom 2:16; Co1 4:5). Prayer (Mat 6:5-6).”

“Let not thy left hand know ... - This is a proverbial expression, signifying that the action should be done as secretly as possible. The Hebrews often attribute actions to members which properly belong to persons. The encouragement for performing our acts of charity in secret is that it will be pleasing to God; that he will see the act, however secret it may be, and will openly reward it. If the reward is not granted in this life, it will be in the life to come. In multitudes of cases, however, alms given to the poor are “lent to the Lord” Proverbs 19:17, and will be repaid in this life. Rarely, perhaps never, has it been found that the man who is liberal to the poor has ever suffered by it…”

“6:4 your Father . . . will reward you: Both now and at the final judgment at the end of history (25:31-46).”

“seeth: Mat 6:6, Mat 6:18; Psa 17:3, Psa 44:21, Psa 139:1-3, Psa 139:12; Jer 17:10, Jer 23:24; Heb 4:13; Rev 2:23 reward: Mat 10:42, Mat 25:34-40; Sa1 2:30; Luk 8:17, Luk 14:14; Co1 4:5; Jde 1:24 Matthew 6:5”