I will liken thee, my son Jehuda, to a whelp, the young of a lion; for from the killing of Joseph my son thou didst uplift thy soul, and from the judgment of Tamar thou wast free. He dwelleth quietly and in strength, as a lion; and as an old lion when he reposeth, who may stir him up?
Why Jacob Called Judah a Young Lion — The Two Rescues
Targum Pseudo-Jonathan on Genesis 49:9