Musannaf Ibn Abi Shayba 21:537

Waki’ narrated to us, from Nadr ibn ‘Arabi, from Ibn Abi Husayn, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The most of my supplication, and the supplication of the prophets before me on the day of Arafah, is: 'There is no god but Allah alone, He has no partner. To Him belongs the dominion, and to Him belongs the praise. He gives life and causes death, and He is capable of all things.'"