Zayd bin Thabit reported,

The Messenger of Allah ﷺ used to pray Dhuhr in the intense midday heat, and there was no prayer harder on the companions of the Messenger of Allah ﷺ than that one. Then this was revealed, "Guard strictly the prayers, and the middle prayer" [Baqarah 2:238].He said, "There are two prayers before it and two prayers after it."

Azami 1820

Sahih

عن زيد بن ثابت قال

كان رسول الله ﷺ يصلى الظهر بالهاجرة ولم يكن يصلي صلاة أشد على أصحاب رسول الله ﷺ منها، فنزلت: {حفظوا على الصلوات والصلوة الوسطى} وقال: إن قبلها صلاتين، وبعدها صلاتين.

الأعظمي 1820صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Prayer
Chapter
Prayer times
Section
Evidence for those who say the middle prayer is Dhuhr
Numbering
Jami al-Kamil 1820 (2nd edition)
Azami 1820