Augustine of Hippo — as excerpted in the Catena Aurea on John 14:1-4

“(Tr. lxvii. 3) But they are rejected by the Christians, who infer from there being many mansions that there is a place outside the kingdom of heaven, where innocent souls, that have departed this life without baptism, and could not there enter into the kingdom of heaven, remain happy. But God forbid, that when every house of every heir of the kingdom is in the kingdom, there should be a part of the regal house itself not in the kingdom. Our Lord does not say, In eternal bliss are many mansions, but they are in My Father’s house.”