Daniel 10:3
I ate no pleasant bread, neither came flesh nor wine in my mouth, neither did I anoint myself at all, till three whole weeks were fulfilled.
Cross-reference
Daniel 10:11 reveals Daniel is 'greatly beloved' — affirming that his mourning posture was acceptable.
Daniel 10:12 explains that from the first day Daniel humbled himself, God heard — confirming the efficacy of his mourning.
Daniel 9:3 describes Daniel fasting in sackcloth and ashes — the same practice of mourning he repeats here.
2 Samuel 19:24 shows Mephibosheth neglecting grooming during mourning — parallels Daniel's not anointing himself as a sign of affliction.
Matthew 6:17 instructs anointing while fasting to avoid appearing mournful — a direct contrast to Daniel's omission of anointing in mourning.
Ecclesiastes 9:8 encourages daily anointing with oil — contrasting with Daniel's deliberate neglect of anointing.
Leviticus 16:29 commands afflicting oneself on the Day of Atonement — parallels Daniel's self-affliction through fasting and no anointing.
Leviticus 23:27 also commands affliction on the Day of Atonement — a parallel to Daniel's voluntary affliction, though for different occasions.
1 Corinthians 9:27 describes Paul's bodily discipline — analogous to Daniel's self-denial here.