Augustine of Hippo : The law then was obviously given on the third day of the third month. Now count the days from the fourteenth of the first month, when the pasch was kept, to the third day of the third month. You will have seventeen of the first month, thirty of the second, three of the third, which makes fifty. — LETTER 55 Augustine of Hippo : Again God produces the ordinary lightnings and thunders. But because they were done in an unusual manner on Mt. Sinai, and those voices were spoken there without a confused noise but in such a manner that it was evident from the most unmistakable proofs, … certain significant meanings were attached to them. Then they were miracles. — THE TRINITY 3.5.11 Caesarius of Arles : When Abraham offered his son Isaac, he was a type of God the Father, while Isaac prefigured our Lord and Savior. The fact that he arrived at the place of sacrifice on the third day is shown to represent the mystery of the Trinity. That the third day should be accepted in the sense of a promise or mystery of the Trinity is found frequently in the sacred books. In Exodus we read, "We will go a three days' journey into the wilderness." Again, upon arriving at Mt. Sinai it is said to the people, "Be sanctified, and be ready for the third day." When Joshua was about to cross the Jordan, he admonished the people to be ready on the third day. Moreover, our Lord rose on the third day. We have mentioned all this because blessed Abraham on the third day came to the place which the Lord had shown him. — SERMON 84.2 Origen of Alexandria : Yet the third day is always made fitting for sacred mysteries. For when the people had gone out of Egypt, on the third day it offers sacrifice to God, and on the third day it is purified; and the resurrection of the Lord is on the third day; and many other mysteries are enclosed within this day. — HOMILIES ON Genesis 8.4