Numbers 2:10

“On the south side shall be the standard of the camp of Reuben, by their armies; and Elizur the son of Shedeur shall lead the sons of Reuben,

Numbers 1:5

These then are the names of the men who shall stand with you: from [the tribe of] Reuben, Elizur the son of Shedeur;

Genesis 49:3-4


“Reuben, you are my firstborn;
My might, the beginning of my strength and vigor,
Preeminent in dignity and preeminent in power [that should have been your birthright].

Numbers 7:30

On the fourth day [it was] Elizur the son of Shedeur, leader [of the tribe] of the sons of Reuben [who presented his offering];

Numbers 7:35

and for the sacrifice of peace offerings, two oxen, five rams, five male goats, five male lambs one year old. This was the offering of Elizur the son of Shedeur [from the tribe of Reuben].

Numbers 10:18

Next the standard of the camp of the sons of Reuben, according to their armies, moved out, with Elizur the son of Shedeur [commander] over its army,

1 Chronicles 5:1

Now [we come to] the sons of Reuben the firstborn of Israel—for Reuben was the eldest, but because he defiled his father’s bed [with Bilhah his father’s concubine], his birthright was given to [Manasseh and Ephraim] the sons of Joseph [the favorite] son of Israel, so that he is not enrolled in the genealogy according to the birthright.

Treasury of Scripture Knowledge

Summary

On the south side shall be the standard of the camp of Reuben according to their armies: and the captain of the children of Reuben shall be Elizur the son of Shedeur.

Bible References

Camp of reuben

Genesis 49:3

“Reuben, you are my firstborn;
My might, the beginning of my strength and vigor,
Preeminent in dignity and preeminent in power [that should have been your birthright].
1 Chronicles 5:1
Now [we come to] the sons of Reuben the firstborn of Israel—for Reuben was the eldest, but because he defiled his father’s bed [with Bilhah his father’s concubine], his birthright was given to [Manasseh and Ephraim] the sons of Joseph [the favorite] son of Israel, so that he is not enrolled in the genealogy according to the birthright.

Elizur

Numbers 1:5
These then are the names of the men who shall stand with you: from [the tribe of] Reuben, Elizur the son of Shedeur;
Numbers 7:30
On the fourth day [it was] Elizur the son of Shedeur, leader [of the tribe] of the sons of Reuben [who presented his offering];
Numbers 10:18
Next the standard of the camp of the sons of Reuben, according to their armies, moved out, with Elizur the son of Shedeur [commander] over its army,

General references

Numbers 1:20
The sons of Reuben, Israel’s (Jacob’s) firstborn, their generations, by their families (clans), by their fathers’ households, according to the number of names, head by head, every male from twenty years old and upward, all who were able to go to war:
Numbers 3:29
The families of the sons of Kohath were to camp on the south side of the tabernacle,
Numbers 7:30
On the fourth day [it was] Elizur the son of Shedeur, leader [of the tribe] of the sons of Reuben [who presented his offering];