الثَّالِثُ: أَنْ يَكُونَ التَّيَمُّمُ بِطَاهِرٍ مِنْ جِنْسِ الْأَرْضِ كَالتُّرَابِ وَالْحَجَرِ وَالرَّمْلِ، لَا الْحَطَبِ وَالْفِضَّةِ وَالذَّهَبِ
Valid examples include pure soil, stone and sand. Loose dust is not required on a clean stone. Materials such as wood, silver and gold are not themselves valid earth-genus materials.
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Tayammum: The Eight Conditions of Validity and Valid Excuses
الثَّالِثُ: أَنْ يَكُونَ التَّيَمُّمُ بِطَاهِرٍ مِنْ جِنْسِ الْأَرْضِ كَالتُّرَابِ وَالْحَجَرِ وَالرَّمْلِ، لَا الْحَطَبِ وَالْفِضَّةِ وَالذَّهَبِ
Valid examples include pure soil, stone and sand. Loose dust is not required on a clean stone. Materials such as wood, silver and gold are not themselves valid earth-genus materials.