Matthew 6:17 in the King James Version
But thou, when thou fastest, anoint thine head, and wash thy face;
Context
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.
17 But you, when you fast, anoint your head and wash your face,
18 so that you are not seen by men to be fasting, but by your Father who is in secret; and your Father, who sees in secret, will reward you.