2 Samuel 20:8 References

8 When they were at the large stone which is in aGibeon, Amasa came to meet them. Now Joab was dressed in his military attire, and over it was a belt with a sword in its sheath fastened at his waist; and as he went forward, it fell out.

a 2 Samuel 2:13, 2 Samuel 3:30

2 Samuel 2

13 And aJoab the son of Zeruiah and the servants of David went out and met them by the pool of Gibeon; and they sat down, one on the one side of the pool and the other on the other side of the pool.

2 Samuel 3

30 So Joab and Abishai his brother killed Abner abecause he had put their brother Asahel to death in the battle at Gibeon.