The Book of Divorce
18/4. Chapter:
Giving one's wife the choice does not count as a divorce, unless it is intended as such
Sahih Muslim
وَحَدَّثَنَاهُ الْحَسَنُ بْنُ عِيسَى، أَخْبَرَنَا ابْنُ الْمُبَارَكِ، أَخْبَرَنَا عَاصِمٌ، بِهَذَا الإِسْنَادِ . نَحْوَهُ .
The above hadith has likewise been narrated through another chain.
Reference : Sahih Muslim 1476bIn-book reference : Book 18, Hadith 32USC-MSA web (English) reference : Book 9, Hadith 3499