2 Samuel 20:8

They [were] near the big rock that [is] in Gibeon, and Amasa came before them. Joab {was dressed in his military clothing}, [with] a utility belt on him and a sword strapped to his waist in its scabbard. Now he went out, and it fell out.

2 Samuel 2:13

Then Joab the son of Zeruiah and the servants of David went out, and they met at the pool of Gibeon. The one group sat on one side of the pool, and the other sat on the other side.

2 Samuel 3:30

So Joab and Abishai, his brother, killed Abner because he had killed Asahel, their brother, at Gibeon in the battle.

2 Samuel 20:4-5

Then the king said to Amasa, "Summon for me the men of Judah [within] three days, {and be here yourself}."

Treasury of Scripture Knowledge

Summary

When they were at the great stone which is in Gibeon, Amasa went before them. And Joab's garment that he had put on was girded unto him, and upon it a girdle with a sword fastened upon his loins in the sheath thereof; and as he went forth it fell out.

Bible References

In gibeon

2 Samuel 2:13
Then Joab the son of Zeruiah and the servants of David went out, and they met at the pool of Gibeon. The one group sat on one side of the pool, and the other sat on the other side.
2 Samuel 3:30
So Joab and Abishai, his brother, killed Abner because he had killed Asahel, their brother, at Gibeon in the battle.

Amasa

2 Samuel 20:4
Then the king said to Amasa, "Summon for me the men of Judah [within] three days, {and be here yourself}."