Adam Clarke on Luke 22:51

Suffer ye thus far - Or, Suffer me to go thus far. As they had now a firm hold of Christ, Mat 26:50, he wished them to permit him to go as far as Malchus, whose ear was cut off, that he might heal it. See the objections brought against this interpretation answered by Kypke; and see the examples he produces. However, the words may be understood as an address to his disciples: Let them proceed; make no resistance; for in this way only are the Scriptures to be fulfilled.