Musannaf Ibn Abi Shayba 21:680

'Abd al-Rahim ibn Sulayman narrated to us, from Hajjaj, from al-Zuhri, from Tariq ibn Abi al-Mahasin, from Abu Hurayrah, who said: A man was brought to the Messenger of Allah, may Allah bless him and grant him peace, who had been stung by a scorpion. He said: "Had he said, 'I seek refuge in the perfect words of Allah from the evil of what He created' (A'udhu bi-kalimatillahi al-tammati min sharri ma khalaq), he would not have been stung," or "it would not have harmed him."