Urwah bin al-Zubayr relates that Marwan bin al-Hakam told him that Zayd bin Thabit (may Allah be pleased with him) said to him: What is the matter with you that you recite the short surahs of the Mufassal in the Maghrib prayer, when the Prophet of Allah (peace and blessings be upon him) used to recite in the Maghrib prayer the longer of the two long surahs (al-tuwalayayn)? Ibn Abi Mulaykah said: I asked Urwah: What is meant by the longer of the two long surahs? He said: Surah al-A'raf.
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4794