Musannaf Ibn Abi Shayba 21:238

Isa ibn Yunus narrated to us, from al-Awza'i, from Hassan ibn Atiyyah, from Shaddad ibn Aws, that he said: "Memorize from me what I say. I heard the Messenger of Allah, may Allah bless him and grant him peace, say: 'When people hoard gold and silver, then hoard these words: O Allah, I ask You for steadfastness in the matter, and determination in [following] the right path. And I ask You for gratitude for Your favor, and I ask You for the excellence of Your worship. And I ask You for a sound heart and a truthful tongue. And I ask You for the best of what You know, and I seek refuge in You from the evil of what You know, and I seek Your forgiveness for what You know; indeed, You are the Knower of the unseen.'"