John 18:6

“As soon then as he had said unto them I am he, etc.] Immediately upon his speaking these words, which were delivered with so much majesty and authority, and were attended with such a divine power: they went backward, and fell to the ground; they were confounded, surprised, and intimidated, and seemed as if they would have chose rather to have fled from him, than to have apprehended him; and as they retired and went backward, they fainted away, as it were, either at the majesty of his looks, or at the power of his words, or both, so that they became like ad men, falling to the ground. Sometimes the majesty of a man’s person, or his fame for some remarkable things done by him, or the innocence…”

“As soon then as he said unto them, I am He, they went backward--recoiled. and fell to the ground--struck down by a power such as that which smote Saul of Tarsus and his companions to the earth (Act 26:14). It was the glorious effulgence of the majesty of Christ which overpowered them. "This, occurring before His surrender, would show His power over His enemies, and so the freedom with which He gave Himself up" [MEYER].”

“They went backward ... - The cause of their retiring in this manner is not mentioned. Various things might have produced it. The frank, open, and fearless manner in which Jesus addressed them may have convinced them of his innocence, and deterred them from prosecuting their wicked attempt. His disclosure of himself was sudden and unexpected; and while they perhaps anticipated that he would make an effort to escape, they were amazed at his open and bold profession. Their consciences reproved them for their crimes, and probably the firm, decided, and yet mild manner in which Jesus addressed them, the expression of his unequalled power in knowing how to find the way to the consciences of men,…”

“As soon as he said, I am he, they went backward and fell to the ground - How amazing is it, that they should renew the assault, after so sensible an experience both of his power and mercy! But probably the priests among them might persuade themselves and their attendants, that this also was done by Beelzebub; and that it was through the providence of God, not the indulgence of Jesus, that they received no farther damage. John 18:8”

“18:6 The soldiers and guards all drew back before the Lord (cp. Isa 6:5; Ezek 1:28; Dan 10:9; Acts 9:4; Rev 1:17). Even Roman soldiers, who were trained not to fall, fell to the ground before Christ. Although they took this posture of submission, they didn’t really understand what had occurred and proceeded with the arrest.”

“they went: Doubtless by the interposition of Divine power; and it was thus shown that Jesus voluntarily resigned himself into their hands. Kg2 1:9-15; Psa 27:2, Psa 40:14, Psa 70:2, Psa 70:3, Psa 129:5; Luk 9:54-56; Act 4:29, Act 4:30 John 18:8”