Numbers 1:24

Of the children of Gad, their generations, by their families, by their fathers houses, according to the number of the names, from twenty years old and upward, all that were able to go forth to war;

Numbers 26:15-18

The sons of Gad after their families: of Zephon, the family of the Zephonites; of Haggi, the family of the Haggites; of Shuni, the family of the Shunites;

Genesis 30:10-11

And Zilpah Leah's handmaid bare Jacob a son.

Genesis 46:16

And the sons of Gad: Ziphion, and Haggi, Shuni, and Ezbon, Eri, and Arodi, and Areli.

Genesis 49:19

Gad, a troop shall press upon him; But he shall press upon their heel.

Numbers 2:14-15

And the tribe of Gad: and the prince of the children of Gad shall be Eliasaph the son of Reuel.

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Summary

Of the children of Gad, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war;

The tribe of gad marched, along with that of simeon, under the standard of reuben; and it seems, on that account, to have been introduced in this order

General references

Bible References

The tribe of gad marched, along with that of simeon, under the standard of reuben; and it seems, on that account, to have been introduced in this order

Numbers 2:14
And the tribe of Gad: and the prince of the children of Gad shall be Eliasaph the son of Reuel.
Numbers 26:15
The sons of Gad after their families: of Zephon, the family of the Zephonites; of Haggi, the family of the Haggites; of Shuni, the family of the Shunites;
Genesis 30:10
And Zilpah Leah's handmaid bare Jacob a son.
Genesis 46:16
And the sons of Gad: Ziphion, and Haggi, Shuni, and Ezbon, Eri, and Arodi, and Areli.
Genesis 49:19
Gad, a troop shall press upon him; But he shall press upon their heel.

General references

Numbers 26:18
These are the families of the sons of Gad according to those that were numbered of them, forty thousand and five hundred.

American Standard Version Public Domain