Then was fulfilled that which was spoken by Jeremiah the prophet, saying,
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John Chrysostom
AD 407
Thus having filled the hearer with horror by relating these things: the slaughter so violent and unjust, so extremely cruel and lawless; he comforts him again, by saying, Not from God's wanting power to prevent it did all this take place, nor from any ignorance of His, but when He both knew it, and foretold it, and that loudly by His prophet. Be not troubled then, neither despond, looking unto His unspeakable providence, which one may most clearly see, alike by what He works, and by what He permits. And this He intimated in another place also, when discoursing to His disciples. I mean where, having forewarned them of the judgment seats, and executions, and of the wars of the world, and of the battle that knows no truce, to uphold their spirit and to comfort them He says, Are not two sparrows sold for a farthing? And one of them shall not fall on the ground without your Father which is in Heaven. Matthew 10:29 These things He said, signifying that nothing is done without His knowledge, ...
Lest anyone think that the slaying of the children took place against the will of God, the evangelist shows that God both knew of it beforehand and foretold it.