Esias 58:4

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?

Esias 58:4 In-Context

2 They seek me day by day, and desire to know my ways, as a people that had done righteousness, and had not forsaken the judgment of their God: they now ask of me righteous judgment, and desire to draw nigh to God,
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.

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