A paper was draughted by Sidney Rigdon against the dissenters from Mormonism, and signed by eighty-four Mormons. It was addressed to Oliver Cowdery, David Whitmer, William W. Phelps and Lyman E. Johnson. Of these, Oliver Cowdery and David Whitmer were two of the three witnesses that testified to the truth of the Book of Mormon. This will therefore serve to show how much credit is to be attached to their testimony. These eighty-four Mormons, in the letter, say to the dissenters, (Cowdery, Whitmer, &c.) that they had violated their promise, and disregarded their covenant; that Oliver Cowdery had been taken by a state warrant for stealing, and the stolen property was found in the house of William W. Phelps, Oliver Cowdery having stolen and conveyed it; that these dissenters had endeavoured to destroy the characters of Smith and Rigdon by every artifice they could invent, not even excepting the basest lying; that they had disturbed the Mormon meetings of worship; that Cowdery and Whitmer had united with a gang of counterfeiters, thieves, liars and blacklegs of the deepest dye, to deceive, cheat and defraud the Mormons out of their property, by every art and stratagem which wickedness could invent, stealing not excepted; that they had attempted to raise mobs against the Mormons; that Cowdery attempted to pass notes on which he had received pay; that Cowdery, Whitmer and others, were guilty of perjury, cheating, selling bogus money, (base coin,) and even stones and sand for bogus! that they had opened, read and destroyed letters in the post-office: and that they were engaged with a gang of counterfeiters, coiners, and blacklegs. There, Mr. Editor, is the character of two of the three witnesses who testified that they had seen the plates of the Book of Mormon; that God's voice declared to them that they had been translated by his gift and power; that an angel of God laid the plates and engravings before their eyes; and that the voice of the Lord commanded them that they should bear record of it. This is the character of two of the three witnesses, according to the testimony of eighty-four _Mormons_, and not _opposers_ of Mormonism. To how much credit these two witnesses are entitled, you can judge for yourself. In the course of my communications on this subject, I shall exhibit the character of the other witness, (Martin Harris,) and likewise of Prophet Smith himself. From the Baptist Advocate. FROM OUR LATE WASHINGTON CORRESPONDENT. MR. EDITOR: