Moreover when you 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.
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Leo of Rome
AD 461
Serm. in Epiph., iv, 5: But that fasting is not pure, that comes not of reasons of continence, but of the arts of deceit.