1 Corinthians 6:3 - Matthew Poole's English Annotations on the Holy Bible

That the saints shall judge angels, is here so plainly asserted, as a thing within their knowledge, that none can doubt it; but how, or when, or what angels, is not so easily determined. The best interpreters understand it of the evil angels, that is, the devils, whom the saints shall judge at the last day, agreeing with the Judge of the whole earth in the sentence which he shall then give against the evil angels, confining them to the bottomless pit, who, while this world lasteth, have a greater liberty as princes of the air, to rove abroad in the air, and to work mightily in the children of disobedience. Others understand the judging of angels here mentioned, of the spoiling of the devils of the kingdom that they exercise in the world, in the places where the gospel hath not prevailed, by lying oracles, and seducing men to idolatry, and the worshipping of devils: in which sense Christ said: Now shall the prince of this world be cast out, Joshua 12:31. From hence the apostle argues the competency of their brethren to judge of and to determine those little matters which were in difference between them, being but things concerning this life, and so of far less consequence than the judging of the world and the evil angels at the last day.