Musannaf Ibn Abi Shayba 21:710

Abdullah ibn Bakr al-Sahmi narrated to us, he said: Hisham al-Dastawa'i narrated to us, from Yahya ibn Abi Kathir, from Abu Ja'far, from Abu Hurayrah, he said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Three supplications are answered, there is no doubt in them: the supplication of the oppressed, the supplication of the traveler, and the supplication of the parent against their child."