Mustadrak al-Hakim — Hadith 3554

It is narrated from Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) and his Companions came to Madinah and the Ansar gave them shelter, all the Arabs shot at them from a single bow (that is, united in hostility against them). Their condition was such that they would not spend the night without weapons, nor would they rise in the morning without weapons. So the Companions said: "Do you think we will ever live such a life that we spend the night in safety and tranquility, fearing no one but Allah?" Then this verse was revealed: "Allah has promised those among you who believe and do righteous deeds that He will surely grant them succession in the land, just as He granted it to those before them, and that He will surely establish for them their religion which He has approved for them, and that He will surely exchange their state of fear for security" [Surah al-Nur: 55]. And He said: "And whoever disbelieves after that," that is, whoever is ungrateful for this blessing, "then it is they who are the defiantly disobedient" [Surah al-Nur: 55].
This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.