Ruwaifi' b. Thabit told that God’s messenger said to him, “You may live for a long time after I am gone, Ruwaifi', so tell people that if anyone ties his beard, or wears round his neck a string to ward off the evil eye, or cleanses himself with animal dung or bone, Muhammad has nothing to do with him. Abu Dawud transmitted it.
Hadith Referenceمشكوة المصابيح / كتاب الطهارة / 351
Hadith Gradingالألبانی:صَحِيح | زبیر علی زئی:صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «صحيح، رواه أبو داود (36) [و النسائي 8/ 135، 136 ح 5070]»