Isaiah 58:3-5

New Catholic Bible

³ They ask, “Why should we fast
    when you do not even notice?
Why should we mortify ourselves
    when you pay no heed?”
The truth is that on your fast days
    you serve your own interests
    and oppress all your workers.
⁴ Your fasting only leads to quarrels and fights
    and lashing out with vicious blows.
Such fasting as you currently practice
    will not make your voice heard on high.
⁵ Is this the type of fast that pleases me,
    a day for a man to humble himself,
to bow his head like a reed
    and lie in sackcloth and ashes?
Is this what you call a fast,
    a day acceptable to the Lord?