Leviticus 16:31

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

Cross-reference

Leviticus 23:32 repeats the command for a Sabbath of solemn rest and affliction on the Day of Atonement, identical wording.

Leviticus 23:27 Historical context

Leviticus 23:27 identifies the tenth day of the seventh month as the Day of Atonement, the same holy day commanded here.

Isaiah 58:3 Contrast

Isaiah 58:3 critiques hypocritical fasting, referencing the same practice of humbling oneself but contrasting outward observance with sincere affliction.

Psalm 35:13 Allusion

Psalm 35:13 uses the same Hebrew root for self-affliction, depicting David's personal fasting and humility, echoing the required affliction on Yom Kippur.

Daniel 10:12 describes Daniel humbling himself (same concept of affliction) in prayer, illustrating a personal application of self-abasement before God.