The Prayer of Greeting the Masjid

558. Abu Qatada, may Allah be pleased with him, reported said that the Messenger of Allah, peace and blessings be upon him, said, “When one of you enters the mosque, he should not sit down until he has prayed two units.” (Sahih al-Bukhari, Salah, 60; Sahih Muslim, Salatu’l-Musafirin, 69).

Nawawi, Imam. Riyad As-Salihin; The Gardens of the Righteous: A collection of authentic hadiths. Tughra Books Press, Inc. 2014