As Iranian religious leader Ayatollah Ruhollah Khomeini proclaimed that Iran today is "the most stable country in the world", the official media reported that antigovernment gunmen killed three Moslem clergymen and revolutionary firing squads executed 50 leftists.

Khomeini said the wave of killings that has decimated Iran's leadership brought no changes, because "when a prime minister is assassinated, another is appointed the same day, and when a president is assassinated, another is elected on schedule and sometimes even ahead of schedule."

Khomeini, who was receiving the new prime minister, Mohammed Reza Mahdavi, and his Cabinet, said it was no great accomplishment to plant a bomb, since this was common all over the world and during all revolutions.

The ayatollah was speaking on the eve of the anniversary of "Black Friday," marking the massacre of demonstrators in Martyrs' Square by the former shah.

Khomeini criticized "corrupt radio stations" for spreading the news that Iran had reached the end of the road.

"Those who don't know Islam believed that the massacre of several thousand people in Martyrs' Square meant that everything was finished. But the power of the people, which is the power of Islam, continued to grow," he said.

Tehran radio and newspapers, meanwhile, highlighted Khomeini's tribute to two previous victims of firebomb assassinations.

The revolutionary patriarch proclaimed the slain general revolutionary prosecutor Hojatoleslam Ali Qodussi and police chief Col. Hooshang Dastgerdiand "martyrs in the service of Islam."

The official Pars News Agency said that in a radio address to the nation, Khomeini blamed their assassinations on "defeated, blind-hearted people who failed to see that the parents and families of the martyrs are proud of their martyrdom."

The broadcast said Hojatoleslam Hussein Tabrizi, chairman of the revolutionary court of West Azerbaijan province, was named to succeed Qodussi, who was killed Saturday by a firebomb explosion in his Tehran office. Huge crowds chanting "Death to America" turned out in Tehran streets for the funeral of Qodussi and Dastgerdi yesterday. Khomeini's heir apparent, Ayatollah Hussein Montazeri, called for sweeping "reforms" in Iran's security services to put an end to "this ugly wave of assassinations," according to the radio. Dastgerdi died Saturday from wounds he suffered in the Aug. 30 bomb blast that killed President Mohammed Ali Rajai and Prime Minister Mohammed Bahonar at the prime ministry in the Iranian capital.

In the killings during this past weekend, an Iranian religious leader was assassinated Sunday in Isfahan, 185 miles south of Tehran, the Kayhan newspaper reported today.

Hojatoleslam Abolfazl Moussavi, who was in charge of war refugees installed in the Isfahan Technical University, was killed by two men on a motorcycle as he left the college, the newspaper said. A person with him was wounded, the report added.

Newspapers said Hojatoleslam Bahauddin Radwan, a candidate for Parliament, and his father Hojatoleslam Mohammed Bared, the priest who officiates at Friday prayers in the town of Kangavar, were killed by unknown gunmen in the western Iranian town in Kermanshah province.

Two revolutionary officials also were reportedly assassinated. Gunmen riding motorcycles also assassinated Sheik Hossein Bagheri, assistant revolutionary prosecutor in the Kurdish city of Sanandaj and Karim Ibrahimi, head of the Revolutionary Committee in the town of Baneh, according to newspaper accounts.

Twenty-two persons, three of them women, described as "hypocrites," official jargon for the opposition Mujaheddin-e-Khalq, were executed at Tehran's Evin Prison, television reported here.

The newspaper Islamic Republic said 22 other leftists were executed in three towns of the Caspian Sea province of Loristan and six in Mazandaran.

This brought to 175 the total of officially announced executions since the Rajai-Bahonar assassination nine days ago, and to more than 625 since the June 22 ouster of moderate president Abolhassn Bani-Sadr.

Iranian Revolutionary Guards killed 20 "counterrevolutionaries" in three separate clashes in western Azerbaijan and in Kurdistan, Tehran press reports said today.

Three Revolutionary Guards died in night-long fighting in Mahabad, capital of Kurdistan Province.