It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) stood among his Companions and said: "Perform ghusl on Friday; for whoever performs ghusl on Friday, (this act) will be an expiation for the period between it and the (next) Friday, with an additional three days."
Imam al-Tabarani (may Allah have mercy on him) said: "No one other than Suwayd bin Abd al-Aziz narrated this hadith from Yahya bin al-Harith."
Hadith Referenceالمعجم الأوسط / باب الميم / 7087
Hadith Takhrij«قال أبو حاتم الرازي: رواه عمر بن عبد الواحد عن يحيى بن الحارث عن القاسم يرفع الحديث إلى رسول الله صلى الله عليه وسلم قال أبي هذا أشبه «علل الحديث، ج 2، ص 571»» «أخرجه الطبراني فى «الكبير» برقم: 7740»