Adam Clarke on Psalms 109:13

Let his posterity be cut off - It is a fact that the distinction among the Jewish tribes in entirely lost. Not a Jew in the world knows from what tribe he is sprung; and as to the royal family, it remains nowhere but in the person of Jesus the Messiah. He alone is the Lion of the tribe of Judah. Except as it exists in him, the name is blotted out.