Joseph cites German in the King Follett Discourse.
Joseph Smith, Discourse, 7 April 1844, as Reported by Thomas Bullock, The Joseph Smith Papers website, accessed July 22, 2024
the Bap[tism] of Water witht. the B[aptism] of Fire & the H G. att[endin]g it are necy he must be born of W[ater] & Sp in order to get into the K of God— in the German text bears me out same as the revn. which I have given for the 14 years— I have the test to put in their teeth that my test has been true all the time you will find it in the decla[ratio]n of John the Bap[tist] (reads from the German) John says I bap[tize] you with Water but when J comes who has the power he shall adm[inister] the bap of F & the H. G. G[rea]t. God now where is all the Sect. [sectarian] world . . . I have preached Latin Hebrew Greek German & I have fulfilled all I am not so big a fool as many have taken me for— the Germans know that I read the German corect—