Thinkest thou that I cannot now pray to my Father? Now follows that special reason which I mentioned a little ago; for Christ reminds them, that he would have at his command a better and more legitimate kind of defense, were it not that he must obey the decree of the Father. The substance of what he says is this. "As he has been appointed by the eternal purpose of God to be a sacrifice, and as this has been declared by the predictions of Scripture, he must not fight against it." Thus Peter's rashness is condemned on another ground, that he not only endeavors to overturn a heavenly decree, but also to obstruct the path of the redemption of mankind. Not only did Peter draw his sword unlawfully, but the disciples were foolish and mad; for--though they were few in number, and feeble--they attempted to make some resistance to a band of soldiers and a very great multitude. On this account, the Lord, in order to make their folly more manifest, employs this comparison. "If he wished to have a guard to defend his life, he would immediately obtain not eleven angels, but a large and invincible army, and since he does not implore that angels may be sent to assist him, much less would he resort to ill-considered means, from which no advantage was to be expected; for the utmost that could be effected by the disciples would be of no more service than if a few rooks were to make a noise." But here some commentators labor to no purpose in inquiring how Christ could have obtained a commission of angels from his Father, by whose decree it was that he had to suffer death. For the two things are inconsistent: that he exposed his Son to death naked and defenseless, because it was necessary that it should be so, and because it had been appointed; and yet, that he might have been prevailed on by prayer to send him relief. But Christ speaks conditionally, that he has a far better method of defending his life, were it not that the will of the Father was opposed to it. This takes away all contradiction, for Christ refrained from presenting such a request to his Father, because he knew that it was contrary to his decree. Yet from this we draw a useful doctrine, that those who resort to unlawful means on the plea of necessity pour dishonor on God. If a man is destitute of lawful aid and support, he runs headlong to wicked schemes and sinful undertakings; and the reason is, that few look for the secret protection of God, which alone ought to be sufficient to set our minds at rest. Are we threatened with danger? Because no remedy can be discovered according to the flesh, we make this or the other contrivance, as if there were no angels in heaven, who -- Scripture frequently tells us -- are placed as guardians for our salvation, (Hebrews 1:14.) In this way we deprive ourselves of their assistance; for all who are impelled, by their restlessness and excessive anxiety, to stretch out their hands to forbidden remedies for evils, do unquestionably renounce the providence of God.

Thinkest thou - Jesus says that not only would Peter endanger himself, but his resistance implied a distrust of the protection of God, and was an improper resistance of his will.
If it had been proper that they should be rescued, God could easily have furnished far more efficient aid than that of Peter - a mighty host of angels.
Twelve legions - A legion was a division of the Roman army amounting to more than 6,000 men. See the notes at Matthew 8:29. The number "twelve" was mentioned, perhaps, in reference to the number of his apostles and himself. Judas being away, but eleven disciples remained. God could guard him, and each disciple, with a legion of angels: that is, God could easily protect him, if he should pray to him, and if it was his will.

More than twelve legions of angels? - As if he had said, Instead of you twelve, one of whom is a traitor, my Father can give me more than twelve legions of angels to defend me. A legion, at different times, contained different numbers; 4,200, 5,000, and frequently 6,000 men; and from this saying, taking the latter number, which is the common rate, may we not-safely believe that the angels of God amount to more than 72,000?

(15) Thinkest thou that I cannot now pray to my Father, and he shall presently give me more than twelve legions of angels?
(15) Christ was taken because he was willing to be taken.

Thinkest thou that I cannot now pray to my Father,.... Meaning, if he thought proper, or that there was any necessity for it, or that he was desirous of being rescued out of such hands he was falling into. This must be understood of him as man: for, as God, the angels were his creatures and ministering servants, whom he had the command of himself, and so had no need, as such, to pray to his Father to detach a number of them to his assistance, and which, as man, he could only want,
And he shall presently give me more than twelve legions of angels. A Roman legion consisted of about six thousand soldiers, or upwards; some add six hundred sixty six; and others make the number far greater. Twelve are mentioned, either with respect to the twelve apostles; or in allusion, as others think, to the Roman militia; a proper and full army with them consisting of such a number of legions: and that there is an innumerable company of angels, thousand thousands, and ten thousand times ten thousand, is certain; and the Persic version here reads; "twelve myriads" of legions; and that these are at the command of God, and he can dispatch them at once, on any emergent occasion, is very evident; and what is it that such a company of angels is not capable of, when a single angel slew in one night an hundred, fourscore, and five thousand men,
2-Kings 19:35, wherefore had Christ had any inclination to have been rescued from the present danger, he stood in no need of Peter's sword.

Or thinkest thou not? etc. The Lord needed no human defenders, had it been the Divine purpose that he should not die.
More than twelve legions of angels? A Roman legion contained from six thousand men upwards. The idea here is a mighty host. He and his eleven faithful apostles are twelve. There is more than a legion for each one of them. He could have evaded the enemies had he chosen; the angels would have come to his rescue, if he had willed it, but he gave himself unto death.

He will presently give me more than twelve legions of angels - The least of whom, it is probable, could overturn the earth and destroy all the inhabitants of it.