https://www.lds.org/manual/doctrine-and-covenants-student-manual/section-60-68/section-64-of-you-it-is-required-to-forgive-all-men?lang=eng
Search on the above page: “Rebellious Are Not of the Blood of Ephraim”
I’ve also spent sometime reading from the book of Ezekiel, chapters 38-40, which don’t directly talk about Ephraim, but rather give some insights into the end of times.
Lineage of Ephraim
Two sections that seem to be relevant to defining who I am in reference to Ephraim:
Isaiah 61:4-11 – Not directly referenced as a prophecy that applies to Ephraim, but the covenant seems familiar.
But ye shall be named the Priests of the Lord: men shall call you the Ministers of our God: ye shall eat the riches of the Gentiles, and in their glory shall ye boast yourselves.
For your shame ye shall have double; and for confusion they shall rejoice in their portion: therefore in their land they shall possess the double: everlasting joy shall be unto them. (vs. 6 & 7)
Doctrine and Covenants 133:26-34 – A direct reference regarding the tribe of Ephraim. The richer blessing is upon Ephraim and his fellows.