Bayhaqī’s Sunan al-Kubrā Ḥadīth [6392] – Supplications by Three are Not Rejected
It is narrated on the authority of Anas bin Mālik (may Allāh be pleased with him) that he said: The Messenger of Allāh (peace and blessings of Allah be upon him) said: “Three supplications are not rejected: The supplication of a parent, the supplication of a fasting person, and the supplication of a traveler.”