5:19 {15} Against an elder receive not an accusation, but before two or three witnesses.
(15) The second rule: allow no accusation to be considered against an elder, unless there are two or three witnesses.
5:19 Against an elder receive not an accusation. Accusations against bishops might be brought before Timothy.
But before two or three witnesses. They were not to be considered unless supported by two or three witnesses. The same rule is found in De 19:15.
5:19 Against an elder - Or presbyter. Do not even receive an accusation, unless by two or three witnesses - By the Mosaic law, a private person might be cited (though not condemned) on the testimony of one witness; but St. Paul forbids an elder to be even cited on such evidence, his reputation being of more importance than that of others.
5:17-25 Care must be taken that ministers are maintained. And those who are laborious in this work are worthy of double honour and esteem. It is their just due, as much as the reward of the labourer. The apostle charges Timothy solemnly to guard against partiality. We have great need to watch at all times, that we do not partake of other men's sins. Keep thyself pure, not only from doing the like thyself, but from countenancing it, or any way helping to it in others. The apostle also charges Timothy to take care of his health. As we are not to make our bodies masters, so neither slaves; but to use them so that they may be most helpful to us in the service of God. There are secret, and there are open sins: some men's sins are open before-hand, and going before unto judgment; some they follow after. God will bring to light the hidden things of darkness, and make known the counsels of all hearts. Looking forward to the judgment-day, let us all attend to our proper offices, whether in higher or lower stations, studying that the name and doctrine of God may never be blasphemed on our account.