Hadith 122

Bulugh al-Maram

Book 8: Marriage
وَفِي رِوَايَةٍ أُخْرَى لِلْبُخَارِيِّ : { وَحُسِبَتْ عَلَيْهِ تَطْلِيقَةً } 1‏ .‏
Another narration by al-Bukhari has:

"It was regarded as one divorce."