18 that your fasting may not be seen by men but by your Father who is in secret; and your Father who sees in secret will reward you.

Matthew Henry's Commentary on Matthew 6:18

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.