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Cyclopedia of Biblical, Theological and Ecclesiastical Literature
(σύζυγος ), a colleague (Philippians 4:3). But many interpreters regard the word there as a proper name, Syzigus (although the gender is uncertain), as it occurs in connection with other actual names, and the person addressed would not otherwise be specified at all.
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McClintock, John. Strong, James. Entry for 'Yoke-Fellow'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/y/yoke-fellow.html. Harper & Brothers. New York. 1870.