I (Dawud al-Raqqi) said to Abu Ibrahim (Musa), peace be on him:
“May I be your ransom, I have grown old. So take my hand and save me from hell-fire. Who is our leader (sahib) after you?”
“This is your leader after me,”
he (Imam Musa), peace be on him said and pointed to his son,
Abu al-Hasan (Imam Reza), peace be on him.