The absolute majority of the scholars are of the opinion that if one pronounces three divorces to one’s wife at one time, they will count as three and an absolutely irrevocable divorce will be established in the marriage. That was the ruling of even the noble companions of the Messenger of Allah (saws) of the stature of Hadrat Abdullah ibn Abbas (r.a.) and of Hadrat Abu Hurayrah (r.a.), etc.

Al-Muwatta Hadith 29.1

Yahya related from Malik that he had heard that a man said to Abdullah ibn Abbas (r.a.), "I have divorced my wife by saying I divorce you a hundred times. What do you think my situation is?" Ibn Abbas (r.a.) said to him, "She was divorced from you by three pronouncements, and by the (other) ninety-seven, you have mocked the Aayat of Allah."

Al-Tirmidhi Hadith 3292 Narrated by Mahmud ibn Labid

When Allah's Messenger (saws) was informed about a man who had divorced his wife, declaring it three times without any interval between them, he (saws) arose in anger and said, "Is a mockery being made of the Book of Allah Who is Great and Glorious, while I am amongst you?" As a result a companion got up and asked, "O Messenger of Allah (saws) shall I kill him?"

rMs .. !!