Abu Da'ud أبو داود السجستاني الأزدي · The Book of Seeking Refuge with Allah

The Prophet said: "A'udhu billahi minal-kufri wad-dain. (I seek refuge with Allah from Kufr and debt.)" A man said: "Are you equating debt with Kufr?" He said: "Yes."

"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.

"When the Prophet traveled, he would seek refuge with Allah from the hardships of travel, and the sorrows of return, from loss after plenty, from the supplication of the one who has been wronged, and from seeing some calamity befall."

"The Messenger of Allah said: 'Seek refuge with Allah from a bad neighbor in one's permanent abode, for one's neighbor in the desert will change.'"