The Messenger of Allah ﷺ said, "Allah is One, the Unique, the Eternal Refuge, equal to a third of the Quran."
حدثنا علي بن محمد حدثنا وكيع عن سفيان عن أبي قيس الأودي عن عمرو بن ميمون
قال رسول الله ﷺ الله أحد الواحد الصمد تعدل ثلث القرآن
Sahih.Sources: Ahmad reported it, 4/122, from Waki with this chain, and Ibn Mahdi followed him in narrating it as well, and Busiri graded it sahih. Nasai also reported it in Al-Kubra, hadith no. 10529, from the hadith of Shubah, from Abu Qays, with this chain.