Cyril of Jerusalem

Again, he is called a Lion; not a man eater, but, as it were, showing by this title his kingly, strong and resolute nature, Then too, he is called a Lion in opposition to the lion, our adversary who roars and devours those who have been deceived. For the Savior came, not having changed his own gentle nature, and yet as the mighty lion of the tribe of Judah, saving them that believe but trampling upon the adversary.

Catechetical Lecture 10:3 ↗

Ambrose of Milan

"A lion's whelp is Judah." Isn't it clear that he represented the Father and manifested the Son? Is there any clearer way to teach that God the Son is of one nature with the Father? The one is the lion, the other the lion's whelp. By this paltry comparison, their unity in the same nature and power is perceived. King proceeds from king, a strong one from one who is strong. Because Jacob foresaw that there would be those to claim that the Son was younger in age, he replied to them by adding, "From my seed you have come up to me. …

On the Blessings of the Patriarchs ↗

Jerome

The sons of your father shall adore you. The lion's cub of Judah, my son, you have risen, bowing down like a lion and like a lion cub. Who will awaken him? Although there is a great mystery about Christ, it is prophesied according to the literal interpretation that kings from the lineage of David through Judah will be born and that all tribes will adore him. For it does not say, the sons of your mother, but the sons of your father. …

Hebrew Questions on Genesis ↗

Bonaventure

In the mystery of the calling, Christ is symbolized by the two sons of Judah, Zarah and Phares, for of him many things are said in happy remembrance, such as this: "A lion's whelp is Judah; from the prey you have gone up, my son. He crouches and couches as a lion; as a lioness, and who will disturb him?" Hence the lawgiver also placed here this figure of the two sons of Judah born of Thamar.

Collations on the Hexaemeron, Collation 14 ↗