Samson never kept the LDS rules of no alcohol, baptism, short hair, etc and so didn't obey the covenants established by himself and God. He married pagan women so he didn't establish an eternal marriage yet is recorded in Hebrews 11 as a great man of faith.
Samson didn't even keep his Nazarite vows of no alcohol touching his lips, no touching of dead animals, and his hair not cut
23: And what shall I more say? for the time would fail me to tell of Gedeon, and of Barak, and of Samson, and of Jephthae; of David also, and Samuel, and of the prophets: