Esias 58:5

5 I have not chosen this fast, nor a day for a man to afflict his soul; neither though thou shouldest bend down thy neck as a ring, and spread under thee sackcloth and ashes, neither thus shall ye call a fast acceptable.

Esias 58:5 In-Context

3 saying, Why have we fasted, and thou regardest not? have we afflicted our souls, and thou didst not know it? Nay, in the days of your fasts ye find your pleasures, and all them that are under your power ye wound.
4 If ye fast for quarrels and strifes, and smite the lowly with fists, wherefore do ye fast to me as this day, so that your voice may be heard in crying?
5 I have not chosen this fast, nor a day for a man to afflict his soul; neither though thou shouldest bend down thy neck as a ring, and spread under thee sackcloth and ashes, neither thus shall ye call a fast acceptable.
6 I have not chosen such a fast, saith the Lord; but do thou loose every burden of iniquity, do thou untie the knots of hard bargains, set the bruised free, and cancel every unjust account.
7 Break thy bread to the hungry, and lead the unsheltered poor to thy house: if thou seest one naked, clothe , and thou shalt not disregard the relations of thine own seed.

The Brenton translation of the Septuagint is in the public domain.