Musannaf Ibn Abi Shayba 33:14

Yahya ibn Abi Bukayr narrated to us, he said: Shu'bah ibn 'Abbad narrated to us, from Ibn Abi Najih, from Mujahid, from Ibn Abbas, he said: "Isa did not speak except with the signs (ayat) with which he spoke, until he reached the age of (other) children."