The Messenger of Allah used to say: "A'udhu billahi minal-kufri wal-faqr. (O Allah, I seek refuge with You from Kufr and poverty.)" A man said: "Are they equal?" He said: "Yes."
Sunan an-Nasa'i Book 50, Hadith 58
← Previous Hadith "I said: 'O Messenger of Allah, teach me a supplication from which I may benefit.' He said: 'Say: Allahumma 'afini min sharri sam'i, wa basari, wa lisani, wa qalbi, wa sharri mani (O Allah, protect me from the evil of my hearing, my seeing, my tongue and my heart, and the evil of my sperm.)" - Meaning his sexual organ.

Sunan an-Nasa'i Book 50, Hadith 57 Next Hadith → When the Prophet went out of his house, he said: "Bismillahi Rabbi! A'udhu bika min an azilla aw adilla aw azlima aw uzlama, aw ajhala aw yujhala 'alayya (In the name of Allah, my Lord, I seek refuge in You from falling into error or going astray, or wrongdoing (others) or being wronged, and from behaving or being treated in an ignorant manner.)"

Sunan an-Nasa'i Book 50, Hadith 59