Moreover when ye fast, be not, as the hypocrites, of a sad countenance: for they disfigure their faces, that they may appear unto men to fast. Verily I say unto you, They have their reward.
Matthew 6:16
King James Version (public domain)
Traditionally attributed to Matthew · 1st century AD · One of the twelve apostles of Jesus; tax collector by trade
Context
14For if ye forgive men their trespasses, your heavenly Father will also forgive you:
15But if ye forgive not men their trespasses, neither will your Father forgive your trespasses.
16Moreover when ye fast, be not, as the hypocrites, of a sad countenance: for they disfigure their faces, that they may appear unto men to fast. Verily I say unto you, They have their reward.
17But thou, when thou fastest, anoint thine head, and wash thy face;
18That thou appear not unto men to fast, but unto thy Father which is in secret: and thy Father, which seeth in secret, shall reward thee openly.