(343) بَابُ مَا يُكْرَهُ مِنَ التَّمَنِّي
Abu Hurayra reported that the Messenger of Allah, may Allah blesshim and grant him peace, said, "When one of you wishes for something, heshould look to what he desires. He does not know what he will be given."
Reference: Al-Adab Al-Mufrad 794
In-book reference: Book 33, Hadith 41
English translation: Book 33, Hadith 794