Sahih Bukhari
Divorce
Volume: 007 / Book Number: 063 / Hadith Number: 194
Narrated Abu Huraira:
The Prophet said, "Allah has forgiven my followers the evil thoughts that occur to their minds, as long as such thoughts are not put into action or uttered." And Qatada said, "If someone divorces his wife just in his mind, such an unuttered divorce has no effect.: