What should Sujood be done upon

What should we do Sujood upon and why? As always we will use refrences from two of the four most authentic books of ahadith , Kitab Al Kafi by Al Kulayni and Al Faqih by As-Sadooq.

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, ‘Alayhi al-Salam, has said, ‘You must not perform Sujud (prostration) on anything except earth or on what grows from earth except cotton and linen.’”

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, ‘Alayhi al-Salam, ‘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.’”

📚Kitab Al Kafi V3,P186

 Hashim Ibn Hakm asked Imam Jafar As-Sadiq(as): Inform me of what it is permitted to do sujood upon and what is not permitted. He said: Sujood is not allowed except for upon the earth or what the earth grows except that which is eaten or worn. So he said to him: May I be your sacrifice, what is the reason for that? He(as) said: It is because sujood is submission to Allah, (swt), so it is not appropriate that it be upon what it eaten and worn. For the sons of the dunyaa (world) are worshipers of what they wear and eat. And the prostrator in his sujood is in the worship of Allah, (swt), so it is not appropriate that he place his forehead in his sujood upon that which is worshiped by the sons of the dunyaa (world), having been deceived by its deception. And sujood upon the earth is better for it is more (conducive) to attaining humility and submission to Allah(swt).

📚Man La Yahdhurhu Al Faqih V1,P192