It is not permissible to perform tayammum with these things unless they have dust on them; because the surfaces used for tayammum are of two types: the first type is from the same category as the earth: such as dust, sand, and stone, and it is permissible to perform tayammum with them without dust. The second type is not from the same category as the earth: and it is not permissible to perform tayammum with them without dust, which includes everything that burns in fire and turns to ash: such as trees, grass, or that which can be shaped and softened: like iron, copper, gold, glass, and similar items, or that which is consumed by the earth: such as wheat, barley, and other grains. The evidence for this is Allah's saying: (So perform tayammum with pure earth), An-Nisa: 43, and 'saa'id' refers to what appears on the surface of the earth from its kind: such as dust, sand, and stone. And from Hudhayfah (may Allah be pleased with him) who said, the Prophet (peace be upon him) said: "We have been preferred over the people in three things: our rows have been made like the rows of the angels, the entire earth has been made a mosque for us, and its dust has been made pure for us when we do not find water," in Sahih Muslim 1: 371, and Sahih Ibn Hibban 4: 595. And from Abu al-Jahm (may Allah be pleased with him): "The Prophet (peace be upon him) came from the direction of 'Bir Jamal' and met him, but the Prophet (peace be upon him) did not respond to him until he approached the wall and wiped his face and hands, then he returned the greeting," in Sahih al-Bukhari 1: 129, and Sahih Ibn Khuzaymah 1: 139, and Sahih Ibn Hibban 3: 85. And from Aisha (may Allah be pleased with her): she said: "When the Messenger of Allah (peace be upon him) had relations with some of his family and was too lazy to get up, he would strike his hand on the wall and perform tayammum," in Al-Mu'jam al-Awsat 1: 202, and Al-Haythami said in Majma' al-Zawa'id 1: 264: "And in it is Baqiyyah ibn al-Walid who is a mudallis." This is supported by what Lady Aisha (may Allah be pleased with her) narrated: "When the Messenger of Allah (peace be upon him) became junub and wanted to sleep, he would perform wudu or tayammum," in Sunan al-Bayhaqi al-Kabir 1: 200, and its chain is good, as in Fath al-Bari. See: I'la al-Sunan 1: 312. And Fath Bab al-'Inayah 1: 115, and Al-Muhit p. 269.