Catena Aurea on Matthew 10:29–31: 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 clay, and again reduced to clay, is once more reformed into a vessel, it needs not that that portion of clay which had formed the handle should again form it, or that which had composed the bottom, should again go to the bottom, so long as the whole was remoulded into the whole, the whole clay into the whole vessel, no part being lost.

Wherefore if the hair so often shorn away would be a deformity if restored to the place it had been taken from, it will not be restored to that place, but all the materials of the old body will be revived in the new, whatever place they may occupy so as to preserve the mutual fitness of parts. Though what is said in Luke, “Not a hair of your head shall fall to the ground,” [Luke 21:18] may be taken of the number, not the length of the hairs, as here also it is said, “The hairs of your head are all numbered.”