Musnad Ahmad 1119:14

Haywah ibn Shurayh and Ibrahim ibn Abi al-Abbas narrated to us, they said: Baqiyyah narrated to us, he said: Buhayr ibn Sa’d narrated to me, from Khalid ibn Ma’dan, from Sayf, from ‘Awf ibn Malik, that he narrated to them: That the Prophet, peace and blessings of Allah be upon him, judged between two men. When the one against whom the judgment was made turned away, he said: "Allah is sufficient for me, and He is the best Disposer of affairs." The Messenger of Allah, peace and blessings of Allah be upon him, said: "Bring the man back to me." He said: "What did you say?" He replied: "I said: Allah is sufficient for me, and He is the best Disposer of affairs." The Messenger of Allah, peace and blessings of Allah be upon him, said: "Indeed, Allah blames for weakness, but you must employ intelligence. If a matter overcomes you, then say: Allah is sufficient for me, and He is the best Disposer of affairs."