Imam Ali b. Moosa al-Reza (a.s.) narrated on the authority of his forefathers (a.s.) culminating in the Holy Prophet (s.a.w.a.) who said – Whoever likes to grab the stem of a red hyacinth that Allah Himself has planted should wholeheartedly seek the mastery of Ali (a.s.) and the immaculate leaders from his progeny, as they are the ones chosen by Allah. They are purified of all sins and faults.
Oyoon Akhbaar al-Reza (a.s.) chap 31 trad 211