Chashach (H2818) appears primarily in Aramaic sections of the Old Testament (Daniel, Ezra), where it means 'to be necessary' or 'to spare.' It captures the concept of what is truly needed or required โ and conversely, what can or cannot be spared.
Daniel 3:16-17 carries its most dramatic use: Shadrach, Meshach, and Abednego tell Nebuchadnezzar, 'We do not need [chashach] to defend ourselves before you.' The word here expresses both sufficiency and freedom โ they had all they needed in God and were not obligated to justify themselves to earthly power. This is profound theology: those who have God lack nothing necessary.