Jareer bin Abdullah reported,

We were with the Messenger of Allah ﷺ in the early part of the day when a group of people came to him, barefoot and nearly naked, draped in striped woolen cloaks, or simply in cloaks, with swords slung over their shoulders. Most of them, indeed all of them, were from Mudar.The face of the Messenger of Allah ﷺ changed color when he saw the destitution they were in. He went inside, then came out and ordered Bilal to call the adhan and the iqamah. He then led the prayer, after which he addressed the people, reciting, "People, fear your Lord, who created you from a single soul," until the end of the verse, "Indeed, Allah is ever, over you, an Observer" [Nisa 4:1], and the verse in al-Hashr, "You who believe, fear Allah, and let every soul look to what it has sent forth for tomorrow, and fear Allah" [Hashr 59:18].He said, "Let a man give in charity from his dinar, from his dirham, from his garment, from a sa of his wheat, from a sa of his dates," until he said, "even if it be half a date."Then a man from the Ansar came with a bag of money so heavy his hand could barely hold it, indeed, it could not. After that, the people followed in succession until I saw two heaps, one of food and one of clothing, and I saw the face of the Messenger of Allah ﷺ beaming as if it were gilded with gold.The Messenger of Allah ﷺ then said, "Whoever establishes a good practice in Islam will have its reward and the reward of all who act upon it after him, without their rewards being diminished in the least. And whoever establishes an evil practice in Islam will bear its burden and the burden of all who act upon it after him, without their burdens being diminished in the least."

عن جرير بن عبد الله البجلي، قال

كنا عند رسول الله ﷺ في صدر النهار، قال: فجاءه قوم حفاة عراة مجتابي النمار- أو العباء متقلدي السيوف عامتهم من مضم- بل كلهم من مضم- فتمعر وجه رسول الله ﷺ لما رأى بهم من الفاقة فدخل ثم خرج فأمر بلالا فأذن وأقام فصلى ثم خطب فقال: {يأيها الناس اتقوا ربكم الذي خلقكم من نفس وحدة} إلى آخر الآية: {إن الله كان عليكم رقيبا} [النساء: ١]، والآية التي في الحشر {يأيها الذين ءامنوا اتقوا الله ولتنظر نفس ما قدمت لغد واتقوا الله} [سورة الحشر: ١٨] تصدق رجل من ديناره من درهمه من ثوبه من صاع بره من صاع تمره. حتى قال: ولو بشق تمرة… قال: فجاء رجل من الأنصار بضرة كادت كفه تعجر عنها- بل قد عجزت- قال: ثم تتابع الناس حتى رأيت كومين من طعام وثياب حتى رأيت وجه رسول الله ﷺ يتهلل كأنه مذهبة. فقال رسول الله ﷺ: من سن في الإسلام سنة حسنة فله أجرها وأجر من عمل بها بعده من غير أن ينقص من أجورهم شيء، ومن سن في الإسلام سنة سيئة كان عليه وزرها ووزر من عمل بها من بعده من غير أن ينقص من أوزارهم شيء.