ISB ~ 1 Timothy 1 v20

Hymenaeus and Alexander:Ringleaders of the erring teachers in Ephesus. So dangerous was their teaching that Paul surrendered them to Satan, i.e., he excommunicated them from the life and liturgy of the Church. This drastic measure is not an irreversible condemnation but a form of disciplinary correction designed to bring about their repentance. Nothing more is known of them unless Hymenaeus is the same person mentioned in 2 Tim 2:17 and unless this Alexander can be linked with the individual in Acts 19:33 or 2 Tim 4:14-15. See note on 1 Cor 5:5.