In 1 Corinthians 4:15, Paul calls himself a father to the Corinthians through the gospel—paralleling Philemon owing his own self as a spiritual child.

In 1 Corinthians 9:2, Paul says the Corinthians are the seal of his apostleship—just as Philemon's conversion validates Paul's ministry.

In 1 Corinthians 16:21, Paul similarly emphasizes his own handwriting as a personal signature—confirming this was his authenticating practice.

In 2 Corinthians 3:2, Paul calls the Corinthians his letter of recommendation—paralleling Philemon as living proof of Paul's spiritual work.

Galatians 6:11 also highlights Paul's own handwriting in large letters—showing his regular practice of personally signing letters for emphasis.

In 1 Timothy 1:2, Paul calls Timothy his true child in the faith—mirroring the spiritual fatherhood implied in Philemon's debt to Paul.

In Titus 1:4, Paul calls Titus his true child in the common faith—paralleling the spiritual paternity behind Philemon owing his own self.

In Genesis 43:9, Judah offers himself as a pledge for Benjamin — mirroring the personal guarantee given here.

Psalm 119:122 asks God to be a surety — same concept of personal guarantee that is extended here.

In Galatians 4:19, Paul uses birth imagery for his spiritual children. Similarly, Philemon's debt of his own self reflects Paul's role as his spiritual father.

Proverbs 6:1 warns against putting up security — contrasting the willing surety offered here. Different context but same core issue.

In Romans 15:27, Gentiles owe material help to Jews for sharing spiritual blessings. Similarly, Philemon owes Paul his very self for spiritual blessings received.