Bay'ah Mosque - Credit: Wikimedia Commons
The Bay'ah Mosque (), also known as the Mosque of 'Aqaba Hill, is a mosque outside Mecca in Saudi Arabia. It was built at the request of Caliph Abu Ja'far al-Mansur in 761 AD at the site of al-Bay'ah, i.e. the place where the Islamic prophet Muhammad met with the Ansar (the supporters), and they took the pledge ('bay'ah', hence the name) of 'Aqaba. Read more on Wikipedia
Source: en.wikipedia.org