John Chrysostom

And besides what hath been mentioned, there is another thing also, which we learn from this; that His providence is not only over all in common, but also over each in particular; which He also declared with respect to His disciples, saying, "But the very hairs of your head are numbered." And from these demoniacs too, one may clearly perceive this; who would have been choked long before, if they had not enjoyed the benefit of much tender care from above.

Homily on the Gospel of Matthew 28 ↗

Augustine of Hippo

Though we may fairly enquire concerning our hair, whether all that has ever been shorn from us will return; for who would not dread such disfigurement. When it is once understood that nothing of our body shall be lost, so as that the form and perfectness of all the parts should be preserved, we at the same time understand that all that would have disfigured our body is to be united or taken up by the whole mass, not affixed to particular parts so as to destroy the frame of the limbs; just as a vessel made of …

Catena Aurea by Aquinas ↗

Jerome

But even the hairs of your head are all counted. Therefore, do not be afraid; you are of more value than many sparrows. The deeper meaning of our previous explanation is expressed: that those who can kill the body should not be afraid, for they cannot kill the soul, and if even small animals do not fall without God's knowledge, how much more so for humans, who are supported by apostolic dignity! …

Commentary on Matthew ↗

Hilary of Poitiers

For when any thing is numbered it is carefully watched over. For it is an unworthy task to number things that are to perish. Therefore that we should know that nothing of us should perish, we are told that our very hairs are numbered.

Catena Aurea by Aquinas ↗