Matthew 6:16
Proper Fasting
6:16 “When you fast, do not look sullen like the hypocrites, for they make their faces unattractive so that people will see them fasting. I tell you the truth, they have their reward.
Matthew 9:15
9:15 Jesus said to them, “The wedding guests cannot mourn while the bridegroom is with them, can they? But the days are coming when the bridegroom will be taken from them, and then they will fast.