Remigius of Auxerre
Catena Aurea · Matthäusevangelium 10
Are not two sparrows sold for a farthing? and one of them shall not fall on the ground without your Father. But the very hairs of your head are all numbered. Fear ye not therefore, ye are of more value than many sparrows.
Figuratively; Christ is the head, the Apostles the hairs, who are well said to be numbered, because the names of the saints are written in heaven.