The Messenger of Allah (s.a.w.a.) informed: On the night of Meraaj, I approached my Lord and I was at a distance of two bows or nearer still (Surah Najm (53):9). He spoke to me between the two Aqeeq (agate) mountains and said:
O Ahmad! I created you and Ali from My own light, and I created these two mountains from the light of Alis face. I swear by My Magnificence that I have created these two mountains to be a sign that is used to identify the believers. And I swore on Myself that I forbid Hell on those who wear the Aqeeq ring on their hands and follow Ali b. Abi Talib.
Ghaayah al-Maraam p 7