Zechariah 7:5
Speak to all the people of the land, and to the priests, saying, When you fasted and mourned in the fifth and seventh month, even those seventy years, did you at all fast to me, even to me?
Torrey's Topical Textbook—AKJV

Matthew 6:18
That you appear not to men to fast, but to your Father which is in secret: and your Father, which sees in secret, shall reward you openly.
Torrey's Topical Textbook—AKJV