“Hebron.” The town of Hebron was 15 miles south of Bethlehem, so we can see why it took Joab and his army all night to get there. Hebron was David’s capital at this time in history, so Joab and likely a good part of David’s army lived there.
“went all night.” Soldiering has always been a physically demanding job. Here we see Joab and his army march all night to reach Hebron. But then, life is difficult and demands mental and physical toughness on the part of every human. The Devil is the god of this age and the whole world is under his influence, so of course life is difficult (2 Cor. 4:4; 1 John 5:19). It is easy to whine and complain about things, but that never changes the circumstances, it only makes the situation more difficult and intolerable. Mature people realize life is difficult and don’t whine about it, they just soldier on. The difficulty of this life should make our great Hope of paradise on earth shine even more brightly.
[For more on the wonderful future earth, see Appendix 3, “Christ’s Future Kingdom on Earth.” For more on how the future will unfold from this present age to the Millennial Kingdom to the Everlasting Kingdom, see commentary on Rev. 21:1].