Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates: A man asked the Prophet (peace and blessings be upon him) about the stoning of the Jamarat: what benefit is there in it for him? Then I heard him say: "You will find it with your Lord at the time when you are most in need of it."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13422