Musannaf Ibn Abi Shayba 33:591

Waki' narrated to us, he said: Al-A'mash narrated to us, from Abu al-Duha, from Masruq, who said: We were with Abu Musa. He said: So we came at night to a ruined orchard. He said: Then Abu Musa stood up at night to pray, and he recited a beautiful recitation. Then he said: "O Allah, You are the Trustworthy (Mu'min), You love the trustworthy; the Guardian (Muhaymin), You love the guardian; the Peace (Salam), You love peace; the Truthful (Sadiq), You love the truthful."