Aswad bin Yazid narrates: Lady Aisha (may Allah be pleased with her) saw me washing the traces of janabah from my garment. She asked: What is this? I replied: This is the trace of janabah that got on my garment. So Lady Aisha (may Allah be pleased with her) said: I remember this about myself, it would also get on the garment of the Prophet (peace be upon him), so he would say, we would scrape it off like this.
Hadith Referenceصحیح ابن حبان / كتاب الصلاة / 2332
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «صحيح سنن ابن ماجه» (537): م (1/ 164).فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرطهما، واصل الأحدب: هو واصل بن حيان الأحدب.