Zayd bin Arqam reported,

The Messenger of Allah ﷺ stood up one day to address us at a watering place called Khumm, between Makkah and Madinah. He praised Allah and glorified Him, then admonished and reminded us, and said:"To proceed. People, I am only a human being, and the messenger of my Lord is about to come to me, and I will answer his call. I am leaving among you two weighty things. The first is the Book of Allah, which contains guidance and light, so take hold of the Book of Allah and cling to it firmly."He urged and encouraged us to follow the Book of Allah, then said, "And the people of my household. I remind you, by Allah, of the people of my household. I remind you, by Allah, of the people of my household. I remind you, by Allah, of the people of my household."Husayn asked him, "Who are the people of his household, Zayd? Are his wives not among the people of his household?"He replied, "His wives are part of his household, but the people of his household are those for whom charity is forbidden after him."Husayn asked, "And who are they?"He answered, "They are the family of Ali, the family of Aqeel, the family of Jafar, and the family of Abbas."Husayn asked, "Is charity forbidden to all of them?"He replied, "Yes."

عن زيد بن أرقم قال

قام رسول الله ﷺ يوما فينا خطيبا بماء يدعى خما بين مكة والمدينة، فحمد الله وأثنى عليه، ووعظ وذكر، ثم قال: أما بعد، ألا أيها الناس! فإنما أنا بشر يوشك أن يأتي رسول ربي فأجيب، وأنا تارك فيكم ثقلين: أولهما كتاب الله فيه الهدى والنور فخذوا بكتاب الله، واستمسكوا به. فحث على كتاب الله ورغب فيه، ثم قال: وأهل بيتي، أذكركم الله في أهل بيتي. أذكركم الله في أهل بيتي. أذكركم الله في أهل بيتي. فقال له حصين: ومن أهل بيته يا زيد؟ أليس نساؤه من أهل بيته؟ قال: نساؤه من أهل بيته، ولكن أهل بيته من حرم الصدقة بعده، قال: ومن هم؟ قال: هم آل علي، وآل عقيل، وآل جعفر، وآل عباس قال: كل هؤلاء حرم الصدقة؟ قال: نعم.