"I heard the Messenger of Allah say: 'Allahumma, inni a'udhu bi-'azamatika an ughtala min tahti (O Allah, I seek refuge in Your greatness from being swallowed up from beneath me.)'"
Sunan an-Nasa'i Book 50, Hadith 102
← Previous Hadith "I said to 'Aishah: 'Tell me of a supplication that the Messenger of Allah used to say.' She said: 'He used to say: Allahumma, inni a'udhu bika min sharri ma 'amiltu wa min sharri ma lam a'mal ba'd (O Allah, I seek refuge in You from the evil of what I have done and from the evil of what I have not done.)'"

Sunan an-Nasa'i Book 50, Hadith 101 Next Hadith → "The Prophet used to say: 'Allahumma (O Allah,)' and he mentioned the supplication, and said at the end, 'A'udhu bika an ughtala min tahti (and I seek refuge with You from being swallowed up from beneath me.)'"

Sunan an-Nasa'i Book 50, Hadith 103