Sahih al-Bukhari, Volume 4, Book 53, Hadith 333 (USC-MSA) ⓘ

Narrated Safiya: (the wife of the Prophet) That she came to visit Allah's Messenger while he was in I`tikaf (i.e. seclusion in the Mosque during the last ten days of Ramadan). When she got up to return, Allah's Messenger got up with her and accompanied her, and when he reached near the gate of the Mosque close to the door (of the house) of Um Salama, the wife of the Prophet, two Ansari men passed by them and greeted Allah's Apostle and then went away. Allah's Messenger addressed them saying, "Don't hurry! (She is my wife)," They said, "Glorified be Allah! O Allah's Messenger (You are far away from any suspicion)," and his saying was hard on them. Allah's Messenger said, "Satan circulates in the mind of a person as blood does (in his body). I was afraid that Satan might put some (evil) thoughts in your minds."

حَدَّثَنَا سَعِيدُ بْنُ عُفَيْرٍ، قَالَ حَدَّثَنِي اللَّيْثُ، قَالَ حَدَّثَنِي عَبْدُ الرَّحْمَنِ بْنُ خَالِدٍ، عَنِ ابْنِ شِهَابٍ، عَنْ عَلِيِّ بْنِ حُسَيْنٍ، أَنَّ صَفِيَّةَ، زَوْجَ النَّبِيِّ صلى الله عليه وسلم أَخْبَرَتْهُ أَنَّهَا جَاءَتْ رَسُولَ اللَّهِ صلى الله عليه وسلم تَزُورُهُ، وَهْوَ مُعْتَكِفٌ فِي الْمَسْجِدِ فِي الْعَشْرِ الأَوَاخِرِ مِنْ رَمَضَانَ ثُمَّ قَامَتْ تَنْقَلِبُ فَقَامَ مَعَهَا رَسُولُ اللَّهِ صلى الله عليه وسلم حَتَّى إِذَا بَلَغَ قَرِيبًا مِنْ باب الْمَسْجِدِ عِنْدَ باب أُمِّ سَلَمَةَ زَوْجِ النَّبِيِّ صلى الله عليه وسلم مَرَّ بِهِمَا رَجُلاَنِ مِنَ الأَنْصَارِ، فَسَلَّمَا عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم، ثُمَّ نَفَذَا فَقَالَ لَهُمَا رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ عَلَى رِسْلِكُمَا ‏"‏‏.‏ قَالاَ سُبْحَانَ اللَّهِ يَا رَسُولَ اللَّهِ‏.‏ وَكَبُرَ عَلَيْهِمَا ذَلِكَ‏.‏ فَقَالَ ‏"‏ إِنَّ الشَّيْطَانَ يَبْلُغُ مِنَ الإِنْسَانِ مَبْلَغَ الدَّمِ، وَإِنِّي خَشِيتُ أَنْ يَقْذِفَ فِي قُلُوبِكُمَا شَيْئًا ‏"‏‏.‏