SHAFAQNA -What are the four essential necessities for Shia Muslims?
It is narrated from Imam Al-Kazim (AS) who said: Our Shia Muslims cannot be without four things: 1) A prayer mat which is suitable to perform Salaat on (having the right conditions necessary, according to Shia beliefs for performing Salaat on it); 2) A ring which is worn on the finger (suitable types as described in various narrations by infallibles); 3) A tooth brush to brush the teeth; 4) A Tasbih (string of beads which is made accordingly) made from the soil of the grave of Imam Hussain (AS) [1].
[1] Tahdhibul Ahkam, Vol. 6, Page 75.