Final answer:
The brethren received and stood upon the terms of the covenant inscribed on the two stone tablets that Moses brought down from the mountain. These represented God's laws and were the foundation of the brethren's lives and religious practices.
Step-by-step explanation:
It appears to refer to a scriptural or religious text. In the context provided which mentions Moses coming down from the mountain with the two stone tablets, the brethren, likely referring to the Israelites, received and stood upon the terms of the covenant that were inscribed on these tablets. The tablets represented God's law and His covenant with the people. The scripture could be understood metaphorically as the foundation upon which the brethren were to build their lives, rules to stand upon in their community and religious practices.
In the second context provided which is more esoteric, discusses the end times and the figure receiving a spiritual message and mission. In this sense, the imagery is again of standing upon a set of beliefs or divine instructions that guides actions and motivations.