Call Upon Sahib Zaman (ajtfs) Before Sunrise

Ayatollah Hassan Ali Nakhodaki (ra) wrote in a letter to one of scholars who had asked about the way to do Tawassul to Imam Mahdi (atfs):

"For any hajat (need) recite this 71 times before sunrise for a week:

Ya Muhammed, Ya Ali, Ya Fatima, Ya Sahib-az-Zaman Adrikni wa la tuhlikni."