It is narrated from Sayyiduna Sahl bin Sa'd (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Everything has a peak, and the peak of the Qur'an is Surah al-Baqarah. Whoever recites it in his house at night, Satan will not enter his house for three nights; and whoever recites it in his house during the day, Satan will not enter his house for three days."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5843