Final answer:
Josiah ordered the destruction of graven images and sacrifices to other deities in his enforcement of the covenant, in line with the commands of the Book of Deuteronomy which prohibits the worship of other gods and mandates strict monotheism.
Step-by-step explanation:
To enforce the covenant, Josiah orders that graven images and sacrifices to all other deities be destroyed. The book of Deuteronomy contains the clearest prohibition of the worship of other gods, as part of the broader context of the Bible which includes the Ten Commandments forbidding the making of graven images and stating 'Thou shalt have no other gods before me.' Various actions were taken throughout the history detailed in the Hebrew Bible to uphold this commandment from Yahweh, including King Josiah's reforms which were aimed at reinstating strict monotheism and the centralization of worship.
This involved the destruction of polytheistic shrines and idols, an action aligned with the theological perspective found in Deuteronomy, which advocates the worship of Yahweh alone and describes significant consequences for failing to comply with this decree.