Musannaf Ibn Abi Shayba 22:363

'Affan narrated to us, he said: Hammam narrated to us, he said: I heard Abu 'Imran al-Jawni say: 'Abd Allah ibn Rabah narrated to us, he said: I heard Ka'b say: The opening of the Torah is the opening of Surat al-An'am. And the conclusion of the Torah is the conclusion of Surat Hud.