Matthew 6:16
16“Moreover when you fast, don’t be like the hypocrites, with sad faces. For they disfigure their faces that they may be seen by men to be fasting. Most certainly I tell you, they have received their reward.
Fasting is assumed—“when you fast”—yet gloom and disfigured faces for an audience are rejected. The hypocrite’s reward is again applause, paid in full. Shared ground with alms and prayer: piety aimed at people empties itself before God.
The verse presses a sincere call away from spiritual theater. Grace enables self-denial without marketing it; believers are responsible not to trade fasting for reputation.
Jesus names the motive: they disfigure their faces that fasting may be seen. Ascetic pain becomes advertising. The verdict matches verses 2 and 5—they have their reward already.
Even hard disciplines can serve the flesh. True fasting is Godward dependence, not a public credential of seriousness.