Hadithcore
Musnad Ahmad 3803
sahih· 2410

It was narrated that 'Abdullah (رضي الله عنه) said:

I heard a man reciting Ha-Meem (i.e., al-Ahqaf); he recited it in one mode of recitation and another man recited it in another mode of recitation that his companion did not use, and I recited it in yet another mode of recitation that my two companions had not used. We came to the Prophet (ﷺ) and told him, and he said: "Do not differ; those who came before you were destroyed because they differed." Then he said: "See which one among you has the most knowledge of recitation, and follow his recitation."

References1 variant
Arabic/English book
Book 26, Hadith 3803