'Descendant' in the Bible

"Now regarding a descendant of Levi who is 25 years and above, he is to enter work in the service at the appointed place of meeting,

Now Izhar's son Korah, the grandson of Kohath, a descendant of Levi, along with Eliab's sons Dathan and Abiram, and Peleth's son On, a descendant of Reuben, took charge

to serve as a memorial to the Israelis, a reminder that no unauthorized person, who isn't a descendant of Aaron, is to attempt to burn incense in the LORD'S presence, so that he may not become like Korah and his group, just as the LORD had spoken by the authority of Moses.