Mujahid narrates from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he was asked about a man who had given his wife a hundred divorces. He said: You have disobeyed Allah, and your wife has become separated from you. You did not fear Allah, so that Allah might make a way out for you. (Then he recited:) "O Prophet, when you divorce women, divorce them at the start of their waiting period." [Surah al-Talaq: 1]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 14944