Sahih Al Bukhari Hadith Number 764

Narrated Marwan bin Al-Hakam: Zaid bin Thabit said to me, “Why do you recite very short Suras in the Maghrib prayer while I heard the Prophet (peace be upon him) reciting the longer of the two long Suras?”

10  Call to Prayers (Adhaan)
Hadith number 764
Volume no 1
Chapter: 98 (The recitation of the Qur’an in the Magrib prayer)