Numbers 1:26
"Of the children of Judah, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war;"
Cross References (ranked by relevance)
And she conceived again, and bare a son: and she said, Now will I praise the LORD: therefore she called his name Judah; and left bearing.
And Joab gave up the sum of the number of the people unto the king: and there were in Israel eight hundred thousand valiant men that drew the sword; and the men of Judah were five hundred thousand men.
And the sons of Judah; Er, and Onan, and Shelah, and Pharez, and Zarah: but Er and Onan died in the land of Canaan. And the sons of Pharez were Hezron and Hamul.
Abraham begat Isaac; and Isaac begat Jacob; and Jacob begat Judas and his brethren;
For Judah prevailed above his brethren, and of him came the chief ruler; but the birthright was Joseph’s:)