Galatians 2:16 establishes justification by faith, not law — the foundation for 2:21's conditional that law-righteousness makes Christ's death pointless.

Galatians 2:18 shows that rebuilding the law makes us lawbreakers, reinforcing why grace cannot be set aside.

Galatians 3:21 echoes the same conditional — if a law could give life, righteousness would be by law — reinforcing Paul's argument.

Galatians 5:2-4 shows the consequence: seeking law-justification severs from Christ and falls from grace — the nullifying of grace described in 2:21.

Galatians 3:18 applies the same logic: inheritance comes by promise, not law — reinforcing that law-based righteousness invalidates Christ's death.

Galatians 5:4 shows the consequence: those seeking justification by law are severed from Christ and fall from grace — exactly Paul's concern here.

Mark 7:9 uses the same Greek verb 'atheteō' (nullify) — Jesus condemns nullifying God's command for tradition, paralleling Paul's refusal to nullify grace.

Romans 10:3 describes those who seek their own righteousness instead of God's — the same error that makes Christ's death pointless in 2:21.

Romans 11:6 states grace and works are mutually exclusive — directly supporting 2:21's claim that law-righteousness nullifies grace.

Hebrews 7:11 argues if Levitical priesthood made perfect, no need for Christ's priesthood — mirroring 2:21's logic that if law gave righteousness, Christ died needlessly.

Romans 3:31 asks if faith nullifies law and answers no — echoing Paul's refusal to nullify grace in Galatians 2:21.

Romans 4:14 states if law-based, faith is empty and promise void — same logic that Christ's death would be pointless.

2 Corinthians 6:1 urges not to receive God's grace in vain — echoing Paul's warning against nullifying grace here.

Luke 7:30 describes Pharisees rejecting God's purpose — parallel to nullifying grace by seeking law-righteousness.

Titus 2:11 declares that grace itself brings salvation — supporting Paul's claim that law cannot, or Christ died needlessly.