16 And when ye fast, be not as the hypocrites, downcast in countenance; for they disfigure their faces, so that they may appear fasting to men: verily I say unto you, They have their reward. 17 But thou, [when] fasting, anoint thy head and wash thy face, 18 so that thou mayest not appear fasting unto men, but to thy Father who is in secret; and thy Father who sees in secret shall render [it] to thee.
Matthew Henry's Commentary on Matthew 6:16-18
Commentary on Matthew 6:16-18
(Read Matthew 6:16-18)
Religious fasting is a duty required of the disciples of Christ, but it is not so much a duty itself, as a means to dispose us for other duties. Fasting is the humbling of the soul, Psalm 35:13; that is the inside of the duty; let that, therefore, be thy principal care, and as to the outside of it, covet not to let it be seen. God sees in secret, and will reward openly.