Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "Three supplications are answered without doubt. The supplication of the oppressed, the supplication of the traveller, and the supplication of the parent for his son."[At- Tirmidhi and Abu Dawud].
App reference: Book 8, Hadith 25
Arabic/English book reference: Book 8, Hadith 980