'Need' in the Bible

May it come on the head of Joab and all his father's family: among the men of Joab's family may there ever be some who are diseased or lepers, or who do the work of women, or are put to the sword, or are wasted from need of food!

Now Barzillai was a very old man, as much as eighty years old: and he had given the king everything he had need of, while he was at Mahanaim, for he was a very great man.

Amasa did not protect himself from the knife in Joab's other hand, and Joab stabbed him in the abdomen, causing Amasa's intestines to spill out on the ground. There was no need to stab him again; the first blow was fatal. Then Joab and his brother Abishai pursued Sheba son of Bicri.