1 Corinthians 16:21 has Paul writing his greeting with his own hand, directly mirroring the same autograph claim and personal touch.

Philemon 1:19 has Paul writing with his own hand, exactly matching the autograph emphasis here and reinforcing his personal pledge.

Romans 16:22 names Tertius as the scribe, while Paul here stresses his own handwriting—both reveal the personal process of letter writing.