Luke 22:36
Then said he unto them, But now, he that hath a purse, let him take it, and likewise his scrip: and he that hath no sword, let him sell his garment, and buy one.
Cross-reference
John 15:20
Parallel
John 15:20 states servants will be persecuted like their master — directly supporting the coming danger in Luke 22:36.
Joel 3:10
Parallel
Joel 3:10 commands turning tools into weapons for battle, directly paralleling Jesus' instruction to sell cloak and buy a sword for the coming crisis.
Matthew 6:28
Contrast
Matthew 6:28 teaches not to worry about clothes, contrasting sharply with selling a cloak for a sword — one trusts God, the other prepares for danger.