All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
This statement is incorrect. Allah, The Exalted, informed us in the Quran of the believer who spoke to the dwellers of Paradise about the disbelief of his companion (in the world); Allah, The Exalted, says (what means): {And they will approach one another, inquiring of each other. A speaker among them will say: Indeed, I had a companion (on earth) who would say, “Are you indeed of those who believe that when we have died and become dust and bones, we will indeed be recompensed?”} [Quran 37:50-53]
Ibn Katheer wrote:
“{They will not hear therein ill speech (Laghw) or commission of sin (Ta'theem), only a saying: Peace, peace.} [Quran 56:25-26] This verse means that in Paradise they will not hear idle talk, as in the verse: {Wherein they will not hear vain talk (Laaghiyah).} [Quran 88:11] Nor will they hear Ta'theem, which means sinful speech. {Only a saying: Peace, peace.} means that they will greet each other with peace (Salaam) just as Allah says in another verse: {And their greeting therein will be: Peace!} [Quran 14:23] Also, the word Salaam may mean 'free of', i.e. their speech will be free of vain and sinful speech.” [Tafseer Ibn Katheer]
Ibn ‘Atiyyah wrote in his Tafseer (exegesis), “Laghw means foul speech, and Ta'theem is derived from Ithm, which means sin, meaning that no one therein will bear a sin or cause others to bear a sin as a result of speaking such speech or listening to it. In the life of this world, people would hear it and be hurt by that.” [Tafseer Ibn ‘Atiyyah]
Allah knows best.