Umar bin Khattab reported,

I heard Hisham bin Hakeem bin Hizam reciting Surah al-Furqan in a way different from how I recited it, and the Messenger of Allah ﷺ himself had taught me how to recite it. I was about to confront him on the spot, but I gave him time until he finished. Then I seized him by his cloak and brought him to the Messenger of Allah ﷺ.I said, "I heard this man reciting in a way different from how you taught me."He said to me, "Let him go."Then he said to Hisham, "Recite."So Hisham recited.The Messenger of Allah ﷺ said, "It was revealed this way."Then he said to me, "Recite."So I recited.He said, "It was revealed this way. The Quran was revealed in seven modes, so recite from it what is easy for you."

Bukhari 2419

Sahih

حدثنا عبد الله بن يوسف أخبرنا مالك عن ابن شهاب عن عروة بن الزبير عن عبد الرحمن بن عبد القاري أنه قال سمعت

عمر بن الخطاب رضي الله عنه يقول

سمعت هشام بن حكيم بن حزام يقرأ سورة الفرقان على غير ما أقرؤها وكان رسول الله ﷺ أقرأنيها وكدت أن أعجل عليه ثم أمهلته حتى انصرف ثم لببته بردائه فجئت به رسول الله ﷺ فقلت إني سمعت هذا يقرأ على غير ما أقرأتنيها فقال لي أرسله ثم قال له اقرأ فقرأ قال هكذا أنزلت ثم قال لي اقرأ فقرأت فقال هكذا أنزلت إن القرآن أنزل على سبعة أحرف فاقرءوا منه ما تيسر

البخاري 2419صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Disputes
Chapter
Opponents speaking against one another
Numbering
Darussalam 2419
Bukhari 2419