Charles Ellicott Commentary 2 Samuel 3:20

"So Abner came to David to Hebron, and twenty men with him. And David made Abner and the men that were with him a feast." — 2 Samuel 3:20 (ASV)

Twenty men. —These were doubtless representative men, selected by Abner from Israel and Benjamin to accompany him and confirm his report. The feast David made for them is not to be understood as mere conviviality, but as a solemn sacrificial feast, such as was customary in ancient times in connection with important negotiations. (Genesis 31:54; 1 Kings 3:15.)