It was narrated that Ibn Mas'ood said:

The Messenger of Allah (ﷺ) taught me Sooratal-Ahqaf and he taught it to someone else, who differed with me in (the recitation of) one verse of it. I said: Who taught you it? He said: The Messenger of Allah (ﷺ) taught me. I said: The Messenger of Allah (ﷺ) taught me such and such. I went to the Messenger of Allah (ﷺ) and there was a man with him. I said: O Messenger of Allah, did you not teach me such and such?' He said: “Yes." The other man said: Did you not teach me such and such? He said: "Yes." And the face of the Messenger of Allah (ﷺ) showed anger. The man who was with him said: Let each of you recite it as he heard it, for those who came before you were doomed because of differences. I do not know whether he told him to say that or if it was something that he said of his own accord.