10. Ali ibn Muhammad has narrated from Sahl from Ahmad ibn Muhammad ibn abu Nasr from ‘Abd al-Karim ibn ‘Amr from al-Hassan ibn Ziyad who has said the following:

“Once abu ‘Abd Allah , was asked about a man whose thigh and knee come in contact with a small drop of urine. He performs Salah (prayer) then remembers that he had not washed it clean? He (the Imam) said, ‘He must perform his Salah (prayer) again.’”