الكافي- ط الاسلامية, volume 3, page 330

6. Ali ibn Muhammad has narrated from certain persons of our people from Marwak ibn ‘Ubayd from certain persons of his people who has said the following: “I once said to abu Ja‘far (a.s.), ‘I am an Imam of the village. During Salah (prayer) I hear the sound of their shoes walking when I am in Ruku‘ (bowing down on one’s knees).’ He (the Imam) said, ‘Wait in your Ruku‘ for the length of your Ruku‘ until the sound stops, otherwise, you can rise to stand up straight.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.

1. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa from Muhammad ibn Khalid and al-Husayn ibn Sa‘id from al-Qasim ibn ‘Urwah from abu al-‘Abbas al-Fadl ibn “Abd al-Malik who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘You must not perform Sujud (prostration) on anything except earth or on what grows from earth except cotton and linen.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.

2. Ali ibn Ibrahim has narrated from his father from and Muhammad ibn ’Isma‘il from al-Fadl ibn Shadhan all from Hammad ibn ‘Isa from Zurarah who has said the following: “I once asked abu Ja‘far (a.s.), ‘Can I perform Sajdah (prostration) on asphalt? He (the Imam) said, ‘No, also not on cotton, wool, anything from animals, food, fruits of earth and not on anything of clothing.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.

3. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from al-Hassan ibn Mahbub who has said the following: “I once asked abu al-Hassan (a.s.), about lime which is fired with feces (dung) and bones of dead animals, then is used in the construction of Masjid. Is performing Sajdah (prostration) permissible on it?’ He (the Imam) wrote with his own hand writing, ‘Water and fire have cleansed it.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.