Romans 4:11

The sign - a seal [σ η μ ε ι ο ν - σ φ ρ α γ ι δ α]. Sign refers to the material token; seal to its religious import. Compare 1 Corinthians 9:2; Genesis 17:11. See on to seal, Revelation 22:10.

That he might be [ε ι ς τ ο ε ι ν α ι α υ τ ο ν]. Not so that he became, but expressing the divinely appointed aim of his receiving the sign.