'Required' in the Bible

Then Elijah said to them, “Seize the prophets of Baal; do not let one of them escape.” They seized them; and Elijah brought them down to the brook Kishon, and [as God’s law required] killed them there.

As the king passed by, the prophet called out to the king and said, “Your servant went out into the middle of the battle, and behold, a man turned aside and brought a man to me and said, ‘Guard this man; if for any reason he is missing, then your life shall be required for his life, or else you shall pay a talent of silver.’