Musannaf Ibn Abi Shayba 17:1109

Waki’ narrated to us, from Usamah bin Zayd, from Nafi’ bin Jubayr, who said: Ka’b said to ‘Abdullah bin ‘Amr, "Do you practice augury (tattayyur)?" He said, "Yes." He said, "Then what do you say?" He said, "I say: O Allah, there is no omen except Your omen, and no good except Your good, and there is no Lord for us other than You." He said, "You are the most learned of the Arabs."