Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) says: The Sunnah method of the ritual bath for janabah is that you wash your hand until you have cleaned it well, then put your right hand into the vessel, pour water with your right hand over your left hand, and wash your private parts until you have cleaned them well. Then place your left hand on a wall or on the ground and rub it, then pour water over it with your right hand and wash it, then perform ablution like the ablution for prayer.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators have been declared trustworthy, except for Abdullah bin Muhammad bin al-Abbas al-Asbahani, whom I do not know.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1473
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«أخرجه المعجم الكبير للطبراني برقم: 10411»