1 John 1:8 warns that claiming sinlessness deceives ourselves; 1:10 adds that it makes God a liar.

1 John 1:6 presents a parallel false claim about fellowship that also results in lying, echoing the pattern here.

In 1 John 2:4, claiming knowledge without obedience makes one a liar, mirroring the pattern of false claim and its consequence here.

In 1 John 5:10, the same charge of making God a liar applies to unbelief in His Son, paralleling the false claim of sinlessness here.

Psalm 143:2 declares no one is righteous before God, reinforcing the truth that claiming sinlessness is false.

Hebrews 6:18 states God cannot lie, reinforcing the gravity of claiming He is a liar as in the main verse.

Psalm 130:3 asks who could stand if God marked sins, echoing the impossibility of claiming sinlessness.