In this single verse, the word “covenant,” or “covenanted” was used five times. According to Hebrew numerology, five was the number that represented blessings, gifts, and generosity. Here, Mormon was really going out of his way to say that he sees this as the ultimate covenant; in a way, he is saying that this is covenanting to the fifth power.
And again, in Alma 6:28–30, when wicked men made a covenant to get gain and follow the devil, Mormon went out of his way to imbed the word covenant five times in that instance as well. Just like fighting fire with fire, these robbers are fighting covenant power with covenant power! (see also 3 Nephi 6:28–30).