stones

I swear to Allah that He achieves His victory using you (the Shia) just as He used the stones.
Imam Ja’far Sadiq (as), Amaali of Tousi 1:167 and Bihar Al-Anwar 42:121

- ‘using stones’ refers to the Year of the Elephant when Abraha was trying to destroy the Kaaba. Allah sent an army of birds who carried stones and destroyed Abraha and his army of elephants.