In a message, Sheikh Qassem described Ayatollah Mesbah Yazdi as an example of true faith in God and devotion to the Holy Prophet (PBUH) and the infallible Imams (AS).
He said the scholar’s demise was a great loss to the Islamic Ummah.
Ayatollah Mesbah Yazdi, who was a member of the Assembly of Experts, died at a hospital in Tehran on Friday evening at the age of 86 due to gastrointestinal disease.
He had been hospitalized since last Saturday after his condition deteriorated.
Ayatollah Mesbah Yazdi played a major part in the uprising — led by late founder of the Islamic Republic Imam Khomeini — that overthrew the US-backed Pahlavi regime in 1979.
Following the Islamic Revolution, Ayatollah Mesbah Yazdi first founded Baqir-ul-Uloom Institute and then Imam Khomeini Education and Research Institute in the city of Qom, which he headed for the rest of his life.
The cleric, a philosopher and political theorist, was a member of the Society of Seminary Teachers of Qom.
He also served as a member of the Assembly of Experts — the body responsible for electing and monitoring the performance of the Leader — and the Supreme Council of Cultural Revolution.