On the fourth day Elizur the son of Shedeur, prince of the children of Reuben
Referenced Verses
Num 1:5 : 5 These are the names of the men who shall stand with you: Of Reuben: Elizur the son of Shedeur.
Num 2:10 : 10 "On the south side shall be the standard of the camp of Reuben according to their divisions. The prince of the children of Reuben shall be Elizur the son of Shedeur.