camp of Reuben

Genesis 49:3, 4
Reuben, you are my firstborn, my might, and the beginning of my strength, excelling in honor, excelling in power. . . .

1 Chronicles 5:1
These were the sons of Reuben the firstborn of Israel. Though he was the firstborn, his birthright was given to the sons of Joseph son of Israel, because Reuben defiled his father's bed. So he is not reckoned according to birthright.

Elizur

Numbers 1:5
These are the names of the men who are to assist you: From the tribe of Reuben, Elizur son of Shedeur;

Numbers 7:30, 35
On the fourth day Elizur son of Shedeur, the leader of the Reubenites, drew near. . . .

Numbers 10:18
Then the divisions of the camp of Reuben set out, under their banner, with Elizur son of Shedeur in command.