Which of the following is known for his piety and memorized the Qur'an by the age of 7: Ahmad Nahavandi or Shah Waliullah Dehlawi?
Ahmad Nahavandi Ahmad ibn Muhammad al-Nahawandi was a Persian astronomer of the 8th and 9th centuries. His name indicates that he was from Nahavand, a city in Iran.
Al-Dhahabi Muhammad ibn Ahmad ibn `Uthman ibn Qayyim `Abu `Abd Allah Shams ad-Din al-Dhahabi (Arabic: محمد بن احمد بن عثمان بن قيم ، أبو عبد الله شمس الدين الذهبي‎ ‎ ), known as Al-Dhahabi (5 October 1274–3 February 1348), a Shafi'i Muhaddith and historian of Islam.