To determine which term or phrase is used in both documents and reflects the author’s purpose for writing, we need to consider the context of the Magna Carta and typical themes within it.
The terms "God," "imprisoned," and "law" have significant implications in the Magna Carta. However, "law" is the most relevant to the purpose of the Magna Carta, which was primarily about establishing the rule of law and limiting the powers of the king.
Therefore, the answer is:
law