Adam Clarke on 2 Samuel 5:1

Then came all the tribes of Israel - Ish-bosheth the king, and Abner the general, being dead, they had no hope of maintaining a separate kingdom, and therefore thought it better to submit to David's authority. And they founded their resolution on three good arguments:

1. David was their own countryman; We are thy bone and thy flesh.

2. Even in Saul's time David had been their general, and had always led them to victory; Thou wast he that leddest out and broughtest in Israel.

3. God had appointed him to the kingdom, to govern and protect the people; The Lord said to thee, Thou shalt feed my people and be a captain over Israel.