Question: A man divorced his wife by saying “I divorce you thrice”; what is the ruling on that? Answer: If a man divorces his wife three times with one word, such as saying, “You are thrice divorced”, the majority of scholars are of the view that the woman is indeed thrice divorced and becomes forbidden …
Islam Fundamentals
Imaam Maalik said,"The Sunnah is like the Ark of Noah. Whoever embarks upon it reaches salvation and whoever refuses is drowned." Quoted by Shaykh-ul-Islaam Ibn Taymiyyah in Majmoo'-ul-fataawaa (4/57)
Islam Fundamentals 