Yahya related to me from Malik from Nafj from Salim andUbaydullah, two sons of Abdullah ibn Umar, that their father Abdullahibn Umar used to send his family and children from Muzdalifa to Minaahead of him so that they could pray subh at Mina and throw the stonesbefore everyone (else) arrived. (ES)
USC-MSA web (English) reference: Book 20, Hadith 180 (ES)
Arabic reference (ES): Book 20, Hadith 880 (ES)