Romans 1:1 also introduces Paul as an apostle of Christ Jesus, though without Timothy, showing his standard self-identification.

1 Corinthians 1:1 uses the exact same phrasing 'apostle of Christ Jesus by the will of God' and names a co-author (Sosthenes), mirroring this introduction.

In 2 Corinthians 1:1, this exact same salutation appears — Paul and Timothy as apostles by God's will.

In Acts 16:1, Timothy is introduced as Paul's disciple, providing the background for why he is called 'our brother' here.

In Romans 16:21, Timothy is also called a fellow worker, reinforcing his role as Paul's companion mentioned here.

In Ephesians 1:1, Paul uses the same 'apostle by God's will' phrase but omits Timothy — a similar opening.

In Philippians 1:1, Paul and Timothy are again co-writers, but they call themselves servants instead of apostles.

In Philemon 1:1, Paul calls himself a prisoner rather than an apostle, but Timothy is still named as brother.