Origen
Catena Aurea · Matthäusevangelium 24
Then if any man shall say unto you, Lo, here is Christ, or there; believe it not. For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect. Behold, I have told you before. Wherefore if they shall say unto you, Behold, he is in the desert; go not forth: behold, he is in the secret chambers; believe it not. For as the lightning cometh out of the east, and shineth even unto the west; so shall also the coming of the Son of man be. For wheresoever the carcase is, there will the eagles be gathered together.
That, If it were possible, is spoken hyperbolically; not that the elect can be led astray, but He wishes to shew that the discourse of heretics is often so persuasive, as to have force to prevail even with those who act2 wisely.