Laylat al-Mabit

Laylat al-Mabīt (Arabic: لَـیْـلَـة ٱلْـمَـبِـیْـت‎) is the night in which the Islamic Nabī (Arabic: نَـبِي‎, Prophet) Muhammad started his emigration from Mecca to Medina. This night is believed to have taken place on the first of Rabi' al-awwal. Due to the decision of Quraysh to kill Muhammad, 'Ali ibn Abu Talib slept in his place and the prophet left Mecca.

The 207th verse of Surat al-Baqarah in the Quran is interpreted as having been revealed in this regard to show the sacrifice of Imam 'Ali for saving the life of the Islamic Prophet:

And of an-nās (Arabic: ٱلـنَّـاس‎, the people) is he who sells his nafs (Arabic: نَـفْـس‎, self), seeking the marḍātillāh (Arabic: مَـرْضَـاتِ ٱلله‎, approval of God). And Allāh is Ra’ūfum-bil-‘ibād (Arabic: رَءُوْفٌۢ بِـٱلْـعِـبَـاد‎, Kind to the servants).

— Qur'an,