Ibn Abbas narrates from the Messenger of Allah (s.a.w.a.) who said: Allah has a pillar made of ruby that is connected to the corner of the Arsh. None except Ali (a.s.) and his Shias will reach it.
Bashaarah al-Mustafa Le Shiah al-Murtaza v 2 p 153 Behaar al-Anwaar v 68 p 135