John Chrysostom
Catena Aurea · Matthäusevangelium 13
Another parable put he forth unto them, saying, The kingdom of heaven is likened unto a man which sowed good seed in his field: But while men slept, his enemy came and sowed tares among the wheat, and went his way. But when the blade was sprung up, and brought forth fruit, then appeared the tares also. So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in thy field; from whence then hath it tares? He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up? But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them. Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn.
This the Lord spake to forbid any putting to death. For we ought not to kill an heretic, seeing that so a never-ending war would be introduced into the world; and therefore He says, Lest ye root out with them the wheat also; that is, if you draw the sword and put the heretic to death, it must needs be that many of the saints will fall with them. Hereby He does not indeed forbid all restraint upon heretics, that their freedom of speech should be cut off, that their synods and their confessions should be broken up—but only forbids that they should be put to death.