Ambrose of Milan
Catena Aurea · Lukasevangelium 22
And he said unto them, When I sent you without purse, and scrip, and shoes, lacked ye any thing? And they said, Nothing. Then said he unto them, But now, he that hath a purse, let him take it, and likewise his scrip: and he that hath no sword, let him sell his garment, and buy one. For I say unto you, that this that is written must yet be accomplished in me, And he was reckoned among the transgressors: for the things concerning me have an end. And they said, Lord, behold, here are two swords. And he said unto them, It is enough.
But He who forbids to strike, why does He order them to buy a sword? unless perchance that there may be a defence prepared, but no necessary retaliation; a seeming ability to be revenged, without the will. Hence it follows, And he who has not, (that is, a purse,) let him sell his garment, and buy a sword.