Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: On the night of Muzdalifah the Messenger of Allah (peace and blessings be upon him) sent us ahead, the young boys of Banu Abd al-Muttalib, on female donkeys, and he (peace and blessings be upon him) would (gently) pat our thighs and say: "My sons, do not stone the Jamrah until the sun has risen."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12645