Abu Hurayra reported that the Prophet, may Allah bless him andgrant him peace, said, "There are three supplications which are answered:
the supplication of the person who is wronged, the supplication of thetraveller, and the supplication of a parent for his child. (IT)
English reference (IT): Book 27, Hadith 481 (IT)
Arabic reference (IT): Book 1, Hadith 481 (IT)