al-Baqarah

The Messenger of Allah (pbuh) is quoted by Ubayy saying, "Whoever recites it will receive blessings from Allah and His mercy and will be granted the rewards due to one who camps for a full year, in the way of Allah, as a soldier on the borders of the Islamic domains to protect them, being constantly on vigil." Then the Messenger of Allah (pbuh) turned to the narrator, Ubayy, and said, "O Ubayy! Order the Muslims to learn it, for learning it is a blessing, while leaving it is a loss, and no magician can ever overpower it."

He (pbuh) is also quoted as saying that everything has a zenith, and the zenith of the Our'an is Surat al-Baqarah. "Which ayat (verse)," he (pbuh) was asked, "in it is the best, O Messenger of Allah?" He (pbuh) said, "Ayat al-Kursi [2:255]," he (pbuh) answered. And he (pbuh) entrusted the youngest among his companions, namely al-Harith ibn Zayd ibn al-Harithah, due to the fact that he knew Surat al-Baqarah by heart, to command an army to defend Islam.