Suppressed Teachings in the Bible about the Afterlife

"...there is evidence that deliberate suppression of teachings about the afterlife has occurred in the literatures of ancient Israel. For example, in an article on "Jeremiah's Prophecies of Jesus Christ," Tvedtnes cites an early Christian passage from Justin Martyr: "And again, from the sayings of the same Jeremiah these have been cut out [by the Jews]: 'The Lord God remembered His dead people of Israel who lay in the graves; and He descended to preach to them His own salvation.'" (Tvedtnes, Most Correct Book, 101.)

There are other teachings that were suppressed. 
WRITINGS OF JEREMIAH THAT TESTIFY OF CHRIST 
Six copies of the book of Jeremiah were found among the Dead Sea Scrolls, along with a copy of the epistle of Jeremiah in Greek. One of the Jeremiah scrolls has a Hebrew version that follows the shorter Septuagint text. The Dead Sea Scrolls also include fragments of two texts about Jeremiah that are not in the Bible. 
The idea that Jeremiah wrote more than is in the biblical book that bears his name is supported by early Christian tradition as well. We have, for example, the testimony of two second-century Church Fathers, Justin Martyr and Irenaeus. Writing of Christ’s preaching to the dead while his body lay in the tomb, each of them attributed to Jeremiah a prophecy not found in the biblical account, in which the prophet wrote that the Lord would descend to preach salvation to the dead. 

Justin Martyr wrote: 
And again, from the sayings of the same Jeremiah these have been cut out [by the Jews]: “The Lord God remembered His dead people of Israel who lay in the graves; and He descended to preach to them His own salvation.” (Dialogue with Trypho 72; Alexander Roberts and James Donaldson, eds., Ante-Nicene Fathers (orig. 1885; reprint Peabody, MA: Hendrickson, 1994), 1:235.)

Irenaeus cites the same passage in Against Heresies 4:22. ( Ibid., 1:493-94. Irenaeus cites the passage in Against Heresies 3:20.4, where he mistakenly attributes it to Isaiah. Ibid., 1:451.) The Book of the Bee, written in the Syriac language in the thirteenth century by the Nestorian bishop Solomon, has preserved an earlier tradition of another non-biblical prophecy of Jeremiah, declaring that,
This (prophet) during his life said to the Egyptians, “a child shall be born—that is the Messiah—of a virgin, and He shall be laid in a crib, and He will shake and cast down the idols.” From that time and until Christ was born, the Egyptians used to set a virgin and a baby in a crib, and to worship him, because of what Jeremiah said to them, that He should be born in a crib. (Ernest A. Wallis Budge, The Book of the Bee 32 (Oxford: Clarendon, 1886), 72.)
The story is drawn from The lives of the Prophets 2:8-10, a text that a number of scholars have suggested was originally written in Hebrew by Egyptian Jews during the lifetime of Jesus himself. (For an English translation of the Jeremiah passage, see James H. Charlesworth, The Old Testament Pseudepigrapha (Garden City: Doubleday, 1985), 2:387-88. Both The Lives of the Prophets and Book of the Bee include prophets of Christ attributed to other Old Testament prophets but not found in the Bible version of their books.)
Another Christian document known from medieval manuscripts in various languages is 4 Baruch, which is subtitled ‘The Things Omitted from Jeremiah the Prophet.” The Ethiopic version attributes the book to Jeremiah’s scribe Baruch, but the Greek says it was written by Jeremiah. Chapter 9 has Jeremiah prophesying of the coming of Jesus Christ, the Son of God, of his selection of twelve apostles, of his death and resurrection after three days, and of his return in glory to the mount of Olives. According to the account, Jeremiah was stoned for this declaration. (Ibid., 1:424-25.)
The Most Correct Book: Insights from a Book of Mormon Scholar Author: John A. Tvedtnes Published by: Salt Lake City; Cornerstone Publishing, 1999 (1st Edition)