Zaid bin Thabit said: The Messenger of Allah ﷺ used to offer the Zuhr prayer in midday heat; and no prayer was harder on the Companions of the Messenger of Allah ﷺ that this one. Hence the revelation came down: "Be guardians of your prayers, and of the midmost prayer" (2: 238). He (the narrator) said: There are two prayers before it and two prayers after it.
Hadith Referenceسنن ابي داود / كتاب الصلاة / 411
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده صحيح, مشكوة المصابيح (637)
Hadith Takhrij« تفرد به أبو داود، (تحفة الأشراف: 3731)، وقد أخرجہ: مسند احمد (5/183)، موطا امام مالک/صلاة الجماعة 7 (27موقوفا) (صحیح) »
Brief Explanation
1؎: Regarding which prayer is meant by the "middle prayer" (salat al-wusta), various hadiths have been narrated in this regard. The most correct opinion is that it refers to the ‘Asr prayer; the majority of scholars incline towards this view. And Allah knows best what is correct.
Explanation & Benefits
Shaykh Umar Farooq Saeedi
411. Commentary: This interpretation is the personal ijtihad of Zayd ibn Thabit (radi Allahu anhu), that what is meant here is the Zuhr (noon) prayer. From other authentic ahadith, it is established that it refers to the Asr (afternoon) prayer. It is possible that those ahadith were not known to him.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 411