Philemon 13

13I wanted to keep him so that he could serve me in your place
This is one of the clearest texts in the NT in which ὑπέρ is used for substitution. Cf. ExSyn 387.
during
Grk "in my imprisonment." Paul seems to expect release from his imprisonment after some time (cf. v. 22), but in the meantime the assistance that Onesimus could provide would be valuable to the apostle.
my imprisonment for the sake of the gospel.
Grk "in the chains of the gospel." On the translation "imprisonment for the sake of the gospel," cf. BDAG 219 s.v. δεσμός 1.a where it says: "Oft. simply in ref. to the locale where bonds or fetters are worn imprisonment, prison (Diod. S. 14, 103, 3; Lucian, Tox. 29; Jos., Ant. 13, 294; 302, Vi. 241; Just., A I, 67, 6 al.) Phil 1:7, 13f, 17; Col 4:18; Phlm 10. μέχρι δεσμῶν 2 Ti 2:9. ἐν τοῖς δ. τοῦ εὐαγγελίου in imprisonment for the gospel Phlm 13; cf. ISm 11:1; Pol 1:1."
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