Luke 5:33-35; Luke 18:12

33 And they said unto him, Why do the disciples of John fast often, and make prayers, and likewise the disciples of the Pharisees; but thine eat and drink ? 34 And he said unto them , Can ye make the children of the bridechamber fast , while the bridegroom is with them? 35 But the days will come , when the bridegroom shall be taken away from them, and then shall they fast in those days.
12 I fast twice in the week, I give tithes of all that I possess .