John Gill Commentary Mark 13:22

"for there shall arise false Christs and false prophets, and shall show signs and wonders, that they may lead astray, if possible, the elect." — Mark 13:22 (ASV)

For false Christs and false prophets shall rise
As there did, both before and after the destruction of Jerusalem:

and shall show signs and wonders ;
as they pretended to do, and did, at least to the appearance of people:

to seduce, if it were possible, even the elect ;
who were chosen in Christ, unto eternal life; in consequence of which they truly believed in him, and were constant followers of him; but this was not possible: though such was the force of their deception, that there was apparent danger of it, were it not for the power and grace of God; (See Gill on Matthew 24:24).