Covenant to keep the "Law of Sacrifice". In doing so, they,
"Covenant to sacrifice all that we possess, even our own lives if necessary, in sustaining and defending the kingdom of God."
The church [LDS] has been identified as the kingdom of god on earth [Mormon Doctrine pg 415]. It is claimed to be a political [physical] kingdom to conquer the world which will be shown in this book. Living, lying, dying and even killing for the kingdom is a sacred covenant of Mormon Temple Initiates.
From the book No Mormon for President; Page 13.