Psalms 35:13

When I wept, and chastened my soul with fasting, that was to my reproach. I made sackcloth also my garment; and I became a proverb to them.

Did not I weep for him that was in trouble? was not my soul grieved for the poor?

And if the house be worthy, let your peace come upon it: but if it be not worthy, let your peace return to you.

But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;

It shall be a sabbath of rest unto you, and ye shall afflict your souls, by a statute for ever.

Bless them which persecute you: bless, and curse not. Rejoice with them that do rejoice, and weep with them that weep.

And it came to pass, when Ahab heard those words, that he rent his clothes, and put sackcloth upon his flesh, and fasted, and lay in sackcloth, and went softly. And the word of the Lord came to Elijah the Tishbite, saying, Seest thou how Ahab humbleth himself before me? because he humbleth himself before me, I will not bring the evil in his days: but in his son’s days will I bring the evil upon his house.

Wherefore have we fasted, say they, and thou seest not? wherefore have we afflicted our soul, and thou takest no knowledge? Behold, in the day of your fast ye find pleasure, and exact all your labours.

Is it such a fast that I have chosen? a day for a man to afflict his soul? is it to bow down his head as a bulrush, and to spread sackcloth and ashes under him? wilt thou call this a fast, and an acceptable day to the Lord?

And this shall be a statute for ever unto you: that in the seventh month, on the tenth day of the month, ye shall afflict your souls, and do no work at all, whether it be one of your own country, or a stranger that sojourneth among you:

And if the son of peace be there, your peace shall rest upon it: if not, it shall turn to you again.

Then came to him the disciples of John, saying, Why do we and the Pharisees fast oft, but thy disciples fast not? And Jesus said unto them, Can the children of the bridechamber mourn, as long as the bridegroom is with them? but the days will come, when the bridegroom shall be taken from them, and then shall they fast.