Final answer:
In the Old Testament, a prophet was considered holy when he obeyed the Lord's commands, as they were individuals who claimed direct communication with the divine and led the people in accordance with divine guidance.
Step-by-step explanation:
In the Old Testament, a figure was considered holy when they obeyed the Lord's commands. While there are several important roles mentioned in biblical texts, such as priests, kings, prophets, and judges, the correct answer to the question is that a prophet was holy when he obeyed the Lord's commands.
A prophet is a person who claims to have direct communication with the divine. Prophets like Moses in the Hebrew Bible played significant roles. They not only conveyed divine messages but also led and guided the people in accordance with God's commandments. For example, Moses, who led the Hebrews out of Egypt, received the Ten Commandments from God, which became a core set of rules that the Israelites had to follow.
A king, such as David, was also considered holy when following God's commands; however, the unique aspect of prophets is their direct line of communication with God and their role in relaying that divine guidance to others.