Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) sent us ahead early from Muzdalifah to Mina while it was still night, and mounted us towards the Jamarat, and he would pat our thighs, saying: "My sons, do not stone Jamrat al-Aqabah until the sun has risen."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12647