Catena Aurea on John 12:12–19: John Chrysostom

The Law enjoined, that on the tenth day of the first month a lamb or a kid should be shut up in the house, and be kept to the fourteenth day of the same month, on the evening of which day it was sacrificed. In accordance with this law, the Elect Lamb, the Lamb without spot, when He went up to Jerusalem to be immolated for the sanctification of the people, went up five days before, i. e. on the tenth day.