Smith's Bible Dictionary
Onesiph'orus. (bringing profit). Onesiphorus is named twice only in the New Testament, namely, 2 Timothy 1:16-18 and 2 Timothy 4:19. Paul mentions him in terms of grateful love, as having a noble courage, and generosity in his behalf, amid his trials as a prisoner at Rome, when others from whom he expected better things had deserted him. 2 Timothy 4:16. Probably, other members of the family were also active Christians. 2 Timothy 4:19. It is evident from 2 Timothy 1:18, that Onesiphorus had his home at Ephesus. (A.D. 64).
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Smith, William, Dr. Entry for 'Onesiphorus'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/o/onesiphorus.html. 1901.