In today's Gospel, Jesus says that Abraham rejoiced to see My day, and he saw it and was glad.
Which day was that? Which day rejoiced the heart of Abraham? St John Chrysostom says that "'My day,' seems to me to mean the day of the Crucifixion, which Abraham foreshowed typically by the offering of the ram and of Isaac."
Let me add, however, that Abraham does not simply see Good Friday. He sees the Holy Sacrifice; which is to say that he sees the Lord’s Day—that is, Abraham sees the Holy Mass. For at the Mass, in the Spirit, you see the Love of the Father. There He lies—the only-begotten Son—in all His glory on the altar. The Son, who in love, was both sacrificed and sacrificed Himself; the Son whose Body was broken so that we might eat and live, and whose Blood was shed so that it might be poured down our throats; the Son who offered Himself so that we, who will taste death, might now taste Life Himself.
It’s this day that Abraham saw and rejoiced to see. And he saw it as he stared at his son, his only son, whom he nearly killed, but whose life was ransomed by the ram of God.