Sayyiduna Abu Huraira (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him) that he (peace be upon him) said: "Three (persons') supplications are (surely) accepted, there is no doubt in their acceptance: the supplication of the oppressed, the supplication of the traveler, and the supplication of a parent against his child."
Hadith Referenceمسند الشهاب / 316
Hadith Gradingمحدثین:إسناده حسن
Hadith Takhrij«إسناده حسن ، أبو داود : 1536، وترمذي : 3448، وابن ماجه : 3862 ، أخرجه ابن حبان فى «صحيحه» برقم: 2699، وأحمد فى «مسنده» برقم: 7626»