Musannaf Ibn Abi Shayba 36:81

Shababa narrated to us, from Warqa’, from Ibn Abi Najih, from Mujahid, regarding His saying: "If you do not aid him," then he mentioned what was the beginning of his affair when he was sent. He says: Allah is the One who will do that for him, aiding him just as He aided him when he was the second of two.