Numbers 1:3-5

World English Bible

³ from twenty years old and upward, all who are able to go out to war in Israel. You and Aaron shall count them by their divisions. ⁴ With you there shall be a man of every tribe, each one head of his fathers’ house. ⁵ These are the names of the men who shall stand with you:

Of Reuben: Elizur the son of Shedeur.