On the way to Karbala, Mostafa Khomeini, and Imam’s eldest son made himself bound to recite and ask others to join Ziarat Jamiah Kabeera and other supplications narrated by infallible successors of the holy prophet of Islam.
In addition, Mostafa Khomeini himself was a great scholar who had well command over several Islamic fields. He was blessed with great divine virtues and he spared no efforts in serving people during those years of spiritual journeys.
(A memoirs about Imam and his family)