Abdullah bin Masud reported,

I heard a man reciting a verse differently from the way the Messenger of Allah ﷺ had taught it to me, so I took him by the hand and brought him to the Prophet ﷺ.The Prophet ﷺ said, "Both of you have recited well."He then became angry, and the anger could be seen on his face.Shuba said, "I am almost certain he said, 'Do not differ, for those before you differed and were destroyed.'"

Ahmad 3908

Sahih

حدثنا بهز حدثنا شعبة حدثني عبد الملك بن ميسرة قال سمعت النزال بن سبرة يحدث

عن عبد الله قال

سمعت رجلا يقرأ آية على غير ما أقرأني رسول الله ﷺ فأخذت بيده فأتيت به النبي ﷺ فقال كلاكما قد أحسن قال وغضب حتى عرف الغضب في وجهه قال شعبة أكبر ظني أنه قال لا تختلفوا فإن من قبلكم اختلفوا فيه فهلكوا

أحمد 3908صحيح
Contents
Reference
Commentary
Ayat
Collection
Musnad Ahmad
Book
Abdullah bin Masud
Numbering
Darussalam 3908
Ahmad 3908