Hadith 136

Bulugh al-Maram

Book 8: Marriage
Hadith 136
وَلِمُسْلِمٍ : { إِذَا حَرَّمَ اَلرَّجُلُ عَلَيْهِ اِمْرَأَتَهُ , فَهِيَ يَمِينٌ يُكَفِّرُهَا } 1‏ .‏
Muslim has:

"When a man makes his wife unlawful for himself, it is (treated like) an oath for which atonement must be made (if broken)."