Ata bin Abi Rabah (may Allah have mercy on him) narrates: I was with Sayyiduna Abdullah bin Umar (may Allah be pleased with them both), and he said: "I was the tenth of ten people in the mosque of the Messenger of Allah (peace and blessings be upon him): (among them were) Sayyiduna Abu Bakr, Sayyiduna Umar, Sayyiduna Uthman, Sayyiduna Ali, Sayyiduna Ibn Mas'ud, Sayyiduna (Mu'adh) bin Jabal, Sayyiduna Hudhayfah, Sayyiduna (Abd al-Rahman) bin Awf and Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with them all), and I was the tenth. Meanwhile a young man of the Ansar came, gave the greeting of salam and then sat down. He said: O Messenger of Allah! Which of the believers is the best? He (peace and blessings be upon him) said: 'The one among them who is best in character.' He asked again: Which of the believers is the most intelligent? He (peace and blessings be upon him) said: 'The one among them who remembers death the most and prepares best for it before it comes to him; these are the truly intelligent ones.'
Then the young man fell silent, and the Prophet (peace and blessings be upon him) turned to us and said: 'O company of Muhajirun! There are five traits; when you are afflicted with them and they befall you, and I seek refuge in Allah from your encountering them: (First,) whenever indecency becomes public in a people, plague and illnesses that did not exist among their predecessors who have passed away spread among them. (Second,) whenever they give short measure and weight, they are seized with years of famine, economic hardship and the oppression of the ruler. (Third,) whenever they withhold the zakah of their wealth, the rain from the sky is withheld from them, and were it not for the animals they would never be given rain. (Fourth,) whenever they break the covenant of Allah and His Messenger, Allah sets their enemy over them, who then wage war on them and take some of what was in their hands (of wealth and goods). (Fifth,) and as long as they do not judge by the Book of Allah, Allah places their strife among themselves.'
Then he (peace and blessings be upon him) ordered Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him) to prepare for a military expedition over which he had appointed him commander. In the morning he came wearing a black cotton turban. The Prophet (peace and blessings be upon him) came to him, undid it, and then (with his own blessed hand) tied the turban on him, letting its end hang four fingers' width or about that behind his back. Then he said: 'O Ibn Awf! Tie the turban like this, for it is more distinctive and better.' Then he (peace and blessings be upon him) ordered Sayyiduna Bilal (may Allah be pleased with him), and he handed the banner to him. He (peace and blessings be upon him) praised Allah and sent blessings upon the Prophet (peace and blessings be upon him) (that is, upon himself), and then said: 'O Ibn Awf! Take it, and fight together in the path of Allah; fight those who disbelieve in Allah. Do not act treacherously and do not mutilate (the slain); this is the covenant of Allah and the Sunnah of your Prophet among you.'"
Hadith Referenceالمعجم الأوسط / باب العين / 4671
Hadith Gradingمحدثین:إسناده حسن
Hadith Takhrij«قال السيوطي: إسناده حسن «عون المعبود شرح سنن أبي داود، ج 4، ص 96؛ تحفة الأحوذي شرح سنن الترمذي، ج 3، ص 49»» «قال الهيثمي: إسناده حسن «مجمع الزوائد ومنبع الفوائد، ج 5، ص 120»» «أخرجه الحاكم فى «المستدرك» برقم: 8718، وابن ماجه فى «سننه» برقم: 4019، 4259، والبزار فى «مسنده» برقم: 6175، وابن حجر فى «المطالب العالية» برقم: 2570، والطبراني فى «الكبير» برقم: 13326، 13619»