Volume 9, Book 85, Number 82:
Narrated Abu Huraira:
Allah's Apostle said, "(The Prophet) Abraham migrated with his wife Sarah till he reached a town where there was a king or a tyrant who sent a message, to Abraham, ordering him to send Sarah to him. So when Abraham had sent Sarah, the tyrant got up, intending to do evil with her, but she got up and performed ablution and prayed and said,
Allahumma in kuntu aamantu bika wa rasulika fala tusallit alaiya kaafir 'O Allah ! If I have believed in You and in Your Apostle, then do not empower this oppressor over me.' So he (the king) had an epileptic fit and started moving his legs violently. "