Final answer:
Enns considers 'covenant' as the core theme of the Old Testament, which represents the special promise between Yahweh and the Hebrew people, signified by the land of Israel and symbolized by the Ark of the Covenant.
Step-by-step explanation:
Enns views covenant as the unifying theme of the Old Testament. The idea of the Covenant is central to the narratives and laws of the Hebrew people, as depicted in the sacred writings of the Old Testament. This Covenant is described as a promise made by Yahweh (the monotheistic deity of the Hebrews) to the Hebrew people, ensuring them a land of peace and prosperity, known as Israel, in exchange for their exclusive worship and adherence to his commandments. The theme of the Covenant is also underscored by its symbolic representation through the Ark of the Covenant, a divine object of immense power that signifies Yahweh's enduring presence and protection over the Hebrews as long as they maintain their part of the agreement.