What is the grammatical subject of yanquḍu in this line?

al-Ḥārith ibn Ḥillizah: Ḥujr, Royal Kinship and the Dhū al-Majāz Covenant (verses 56–67)

• Mā — that which
• Ḥadhara — precaution
• Al-ahwāʾu — desires
• Al-mahāriqi — documents