It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Even the lowest person of my Ummah can grant protection (to an enemy)." And the hadith narrated from Sayyiduna Amr bin al-As (may Allah be pleased with him) is well known: when he entered upon Muhammad bin Abi Bakr (at the time of his killing), he asked him: Are you Muhammad bin Abi Bakr? He said: Yes. He asked: Have you come with any guarantee of safety? He said: No. So he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "The blood of all the Muslims is equal." This hadith also has supporting reports from Sayyiduna Abu Hurayrah and Amr bin al-As (may Allah be pleased with them both).

It is narrated from Sayyidah Aishah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "The protection (dhimmah) of the Muslims is one; so if even one of them grants protection, do not break faith with it, for every treacherous person will have a banner on the Day of Resurrection by which he will be recognized." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it with this wording; they only agreed on mentioning the treacherous person (the one who breaks his word).

It is narrated from Sayyiduna Samurah bin Jundub (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Do not reside with the polytheists and do not gather with them; whoever resides with them or gathers with them is not one of us." This hadith is sahih (authentic) on the condition of Bukhari, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that a man from the Ansar embraced Islam, then apostatized and joined the polytheists. Then he regretted it and sent word to his people: Ask the Messenger of Allah (peace and blessings be upon him): Is there any room for repentance for me? So these verses were revealed: "How shall Allah guide a people who disbelieved after their belief" up to His saying: "Except those who repent after that and reform themselves, for indeed Allah is Most Forgiving, Most Merciful." [Al Imran: 86-89] . The narrator said: Then his people sent word to him, and he embraced Islam (again). This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) that whenever the Prophet (peace and blessings be upon him) felt danger from a people, he would make this supplication: 'Allahumma inna naj'aluka fi nuhurihim, wa na'udhu bika min shururihim' (O Allah, we place You as a shield against them, and we seek refuge in You from their evils). This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), and my strongest assumption is that they did not record it.

It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to make this supplication: 'Allahumma amti'ni bi-sam'i wa basari, waj'alhuma al-waritha minni; Allahumma-nsurni 'ala 'aduwwi, wa arini fihi tha'ri' (O Allah, let me benefit from my hearing and my sight (throughout my life) and make them my heir; O Allah, help me against my enemy and grant me victory over him, so that I see my revenge on him with my own eyes). This hadith is sahih (authentic) on the condition of Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Abu Bakrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever kills a mu'ahad (a non-Muslim granted a covenant of safety) without just cause, Allah will forbid Paradise for him." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Nu'aym bin Mas'ud al-Ashja'i (may Allah be pleased with him); he said: I heard the Messenger of Allah (peace and blessings be upon him) say to the two envoys of Musaylimah (the Liar), when he (peace and blessings be upon him) had read Musaylimah's letter: "What do you two say?" They said: We say as he (Musaylimah) said. So he (peace and blessings be upon him) said: "By Allah, were it not the rule that envoys are not killed, I would have struck off both your necks." This hadith is sahih (authentic) on the condition of Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Ali (may Allah be pleased with him); he said: When the fighting grew fierce and the two armies met face to face, we would take shelter behind the Messenger of Allah (peace and blessings be upon him) (to protect ourselves from the enemy's attacks), and none of us would be as close to the enemy as the Messenger of Allah (peace and blessings be upon him) was (because of his courage). This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "One military expedition at sea is better than ten expeditions on land; whoever crosses the sea, it is as though he has crossed all the valleys; and the one who becomes dizzy at sea (because of the waves) has a reward equal to one who is rolling in his own blood in the path of Allah." This hadith is sahih (authentic) on the condition of Bukhari, but the two Shaykhs (Bukhari and Muslim) did not record it.