Remigius of Auxerre
Catena Aurea · Matthäusevangelium 10
And the brother shall deliver up the brother to death, and the father the child; and the children shall rise up against their parents, and cause them to be put to death. And ye shall be hated of all men for my name’s sake: but he that endureth to the end shall be saved.
That is, He who shall not let go the commands of the faith, nor fall away in persecution, shall be saved; he shall receive the reward of the heavenly kingdom for his earthly persecutions. And note that ‘the end’ does not always mean destruction, but sometimes perfection, as in that, Christ is the end of the Law. (Rom. 10:4.) So the sense here may be, Whosoever shall endure to the end, that is, in Christ.