1 Chronicles 5:10

And in the days of Saul they made war on the Hagarites, and overcame them; and they put up their tents through all the land east of Gilead.

Genesis 21:9

And Sarah saw the son of Hagar the Egyptian playing with Isaac.

Genesis 25:12

Now these are the generations of Ishmael, the son of Abraham, whose mother was Hagar the Egyptian, the servant of Sarah:

1 Chronicles 5:18-21

There were forty-four thousand, seven hundred and sixty of the sons of Reuben and of the Gadites and of the half-tribe of Manasseh, all strong men, expert in the use of the body-cover, the sword, and the bow, and in the art of war, all able to take up arms.

Treasury of Scripture Knowledge

Summary

And in the days of Saul they made war with the Hagarites, who fell by their hand: and they dwelt in their tents throughout all the east land of Gilead.

Bible References

The hagarites

1 Chronicles 5:19
And they went to war against the Hagarites, with Jetur and Naphish and Nodab.
Genesis 21:9
And Sarah saw the son of Hagar the Egyptian playing with Isaac.
Genesis 25:12
Now these are the generations of Ishmael, the son of Abraham, whose mother was Hagar the Egyptian, the servant of Sarah:

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain