510. Why does the Quran run into controversies by saying that the tongue will talk and not at the same time.

These two verses (24:24, 36:65) of the Quran may seem like contradicting each other. 

Verse 24:24 of the Quran says, in the hereafter world the tongue of men will bear witness, and at the same time verse 36:65 says the mouth of men will be sealed in the hereafter.

In this world the tongue alone speaks of the deeds of other organs, because the other organs cannot talk.

But in the hereafter, each and every organ will bear witness to all acts done by them, which is the reason the mouth is sealed there. 

But the tongue will be a witness to its own deeds, is what is expressed here as the tongue bears witness. There in the hereafter, the tongue cannot stand witness to what the other organs have done, it stands for its own deeds.

The verse that speaks about the tongue being a witness, refers to slander by the person.

The tongue which had powers over all the other organs to talk on their behalf in this world will be divested of the powers in the hereafter, to speak only about itself. This is the message here and there is no contradiction in the Quran regarding this matter.