Philippians 1:12
But I would ye should understand, brethren, that the things which happened unto me have fallen out rather unto the furtherance of the gospel;
Cross-reference
Psalm 76:10 says human wrath results in God's praise — the exact principle Paul experienced as his imprisonment spread the gospel.
Acts 8:4 shows persecution scattering believers who preached everywhere — the same dynamic of opposition advancing the gospel that Paul describes.
Acts 11:19-21 continues the theme: scattered believers preach to Greeks and many believe, mirroring how Paul's hardship furthered the gospel.
Acts 21:28-36 records Paul's temple arrest — the very imprisonment he says advanced the gospel.
Acts 22:1-30 shows Paul's defense after his arrest, part of the events he refers to that furthered the gospel.
Acts 28:1-31 describes Paul's arrival in Rome and his bold preaching while imprisoned, directly showing how his chains advanced the gospel.
Romans 8:28 states all things work for good for those who love God — the very principle Paul sees at work in his imprisonment.
In 2 Timothy 2:9, Paul echoes that his chains cannot bind God's word — both verses show imprisonment advancing the gospel.
In Ephesians 3:13, Paul says his sufferings are the Gentiles' glory — both verses present suffering as beneficial for the gospel's advance.
In 2 Timothy 4:17, Paul says the Lord strengthened him so the gospel could be fully proclaimed — directly parallels how his imprisonment served to advance the message.