Numbers 2:10

On the south side shall be the standard of the camp of Reuben according to their armies. And the ruler of the sons of Reuben shall be Elizur the son of Shedeur.

Numbers 1:5

And these are the names of the men who shall stand with you. Of Reuben: Elizur the son of Shedeur.

Genesis 49:3-4

Reuben, thou are my firstborn, my might, and the beginning of my strength, the pre-eminence of dignity, and the pre-eminence of power.

Numbers 7:30

On the fourth day [was] Elizur the son of Shedeur, ruler of the sons of Reuben.

Numbers 7:35

and for the sacrifice of peace-offerings, two oxen, five rams, five he-goats, five he-lambs a year old. This was the oblation of Elizur the son of Shedeur.

Numbers 10:18

And the standard of the camp of Reuben set forward according to their armies, and over his army was Elizur the son of Shedeur.

1 Chronicles 5:1

And the sons of Reuben the first-born of Israel (for he was the first-born, but, inasmuch as he defiled his father's couch, his birthright was given to the sons of Joseph the son of Israel, and so the genealogy is not to be reckone

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, thou are my firstborn, my might, and the beginning of my strength, the pre-eminence of dignity, and the pre-eminence of power.
1 Chronicles 5:1
And the sons of Reuben the first-born of Israel (for he was the first-born, but, inasmuch as he defiled his father's couch, his birthright was given to the sons of Joseph the son of Israel, and so the genealogy is not to be reckone

Elizur

Numbers 1:5
And these are the names of the men who shall stand with you. Of Reuben: Elizur the son of Shedeur.
Numbers 7:30
On the fourth day [was] Elizur the son of Shedeur, ruler of the sons of Reuben.
Numbers 10:18
And the standard of the camp of Reuben set forward according to their armies, and over his army was Elizur the son of Shedeur.

General references

Numbers 1:20
And the sons of Reuben, Israel's first-born, their generations, by their families, by their fathers' houses, according to the number of the names, by their polls, every male from twenty years old and upward, all who were able to go
Numbers 3:29
The families of the sons of Kohath shall encamp on the side of the tabernacle southward.
Numbers 7:30
On the fourth day [was] Elizur the son of Shedeur, ruler of the sons of Reuben.