Sahl b. Abu Hathma related that God’s messenger used to say, “When you estimate take them leaving a third, and if you do not leave a third leave a quarter.” * Tirmidhi, Abu Dawud and Nasa'i transmitted it. * This is interpreted by some as meaning that a third or a quarter was not to be reckoned when assessing the tax.
Hadith Referenceمشكوة المصابيح / كتاب الزكاة / 1805
Hadith Gradingالألبانی:لم تتمّ دراسته | زبیر علی زئی:إسناده حسن
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «إسناده حسن، رواه الترمذي (643) وأبو داود (1605) والنسائي (42/5 ح 2493)»