Matthew 27:15δέσμιον
Now it was the governor’s custom at the feast to release to the crowd a prisoner of their choosing.
Mark 15:6δέσμιον
Now it was Pilate’s custom at the feast to release to the people a prisoner of their choosing.
Acts 16:25δέσμιοι
About midnight Paul and Silas were praying and singing hymns to God, and the other prisoners were listening to them.
Ephesians 3:1δέσμιος
For this reason I, Paul, the prisoner of Christ Jesus for the sake of you Gentiles...
Philemon 1:1δέσμιος
Paul, a prisoner of Christ Jesus, and Timothy our brother, To Philemon our beloved fellow worker,
Hebrews 10:34δεσμίοις
You sympathized with those in prison and joyfully accepted the confiscation of your property, knowing that you yourselves had a better and permanent possession.

Abbott-Smith

δέσμιος, -ον (also -α, -ον;
δεσμός), [in LXX for אסר;]

1. binding.

2. bound, captive; ὁ δ., as subst., a prisoner: Mat.27:15, 16, Mrk.15:6, Act.16:25, 27 23:18 25:14, 27 28:16 (Rec.) 17, Heb.10:34 13:3; ὁ δ. τοῦ Χριστοῦ, Eph.3:1, 2Ti.1:8, Phm 1, 9; ὁ δ. ἐν κυρίῳ, Eph.4:1.†
(AS)

Sources: Abbott-Smith’s Manual Greek Lexicon of the New Testament (1922, public domain) and glosses from STEPBible TBESG (CC BY 4.0); STEPBible TAGNT (Greek New Testament, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.