William Burkitt on Matthew 24:23

The Jews had all along cherished in themselves a vain expectation, that the promised Messiah should be a temporal deliverer, that should set them at liberty from the power and slavery of the Romans; and accordingly Christ declares to his disciples here, that immediately before Jerusalem's destruction, several persons, taking the advantage of this expectation, would make themselves heads of parties, and pretend tha they were the true Messiah, who would save and deliver them from their enemies, if they would repair to them, and follow after them.

Hereupon our Lord cautions his disciples against such false Christs and false prophets, and bids them believe them not, though they did never so many great signs and wonders, and promised them never such glorious deliverances.

Learn hence, That the church's great danger is from seducers that come in Christ's name, and pretend to work signs and wonders by his authority.

2. That such is the power of seduction and delusion, that many are carried away with seducers and false teachers.

3. That the elect themselves, if left unto themselves, might be seduced; but divine power guards them against seduction and delusion: They shall deceive, if it were possible, the very elect. Which phrase imports not what the event would be upon the elect, but the vehemency of the endeavours of seducers; namely, that they would do the utmost that they could, to shock the Christian, and cause him to fall upon his steadfastness.