Sahih al-Bukhari 2311

It is related that Abu Hurayra said, "The Messenger of Allah, may Allah bless him and grant him peace, put me in charge of guarding the zakat of Ramadan. Someone came to me and began to take handfuls of food. I grabbed him and said, 'By Allah, I will take you to the Messenger of Allah, may Allah bless him and grant him peace!' He said, 'I am needy and have a large family and I am in dire need.'" He said, "I let him go and in the morning the Prophet, may Allah bless him and grant him peace, said, 'Abu Hurayra, what did you do with your prisoner yesterday?'" He said, "I said, 'Messenger of Allah, he complained of dire need and a large family, so I showed mercy to him and let him go on his way.' He said, 'He lied to you and he will come back.' So, from the words of the Messenger of Allah, may Allah bless him and grant him peace, 'he will come back.', I knew that he would come back. Therefore, I lay in wait for him and he came and once more began to take handfuls of food. I seized him and said, 'I will take you to the Messenger of Allah, may Allah bless him and grant him peace!' He said, 'Let me go. I am in need and have a large family. I will not come back again.' I had mercy on him and let him go his way. In the morning the Messenger of Allah, may Allah bless him and grant him peace, said to me, 'Abu Hurayra, what did you do with your prisoner yesterday?' I said, 'Messenger of Allah, he complained of dire need and a large family, so I showed mercy to him and let him go on his way.' He said, 'He lied to you and he will come back.' So I lay in wait for him a third time and he came and began to take handfuls of food. I grabbed him and said, 'I will take you to the Messenger of Allah, may Allah bless him and grant him peace! This is the third time. You claimed you would not come back and then you came back.' He said, 'Let me go. I will teach you some words which will help you with Allah.' I said, 'What are they?' He said, 'When you go to bed, recite the Throne Verse, "Allah, there is no god but Him, the Living, the Self-Sustaining..." to the end of the ayat. You will have someone guarding over you from Allah and shaytan will not come near you until morning.' So I let him go his way. In the morning, the Messenger of Allah, may Allah bless him and grant him peace, said to me, 'What did you do with your prisoner yesterday?' I said, 'Messenger of Allah, he claimed that he would teach me some words which would help me with Allah, so I let him go his way.' He said, 'What are they?' I said, 'He said to me, "When you go to bed, recite the Throne Verse to the end: 'Allah, there is no god but Him, the Living, the Self-Sustaining'." He said to me, "You will have someone guarding over you from Allah and shaytan will not come near you until morning."' (They were exceedingly eager for good.) The Prophet, may Allah bless him and grant him peace, said, "He told you the truth even though he is a liar. Do you know whom you were speaking with on these three days, Abu Hurayra?'" He said, "No." The Prophet said, "It was Shaytan."