Hadith 980 - Bab 172 (Desirability of Supplications during the Journey)
Chapter 8 (The Book of Etiquette of Traveling)

Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah (Peace be upon him) 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].

Selon Abou Hourayra (das), le Messager de Dieu (bsdl) a dit: «Trois invocations sont exaucées sans aucun doute: