Bulugh al-Maram 1 The Book of Purification كتاب الطهارة 154

وَفِي حَدِيثِ حُذَيْفَةَ عِنْدَ مُسْلِمٍ: { وَجُعِلَتْ تُرْبَتُهَا لَنَا طَهُورًا, إِذَا لَمْ نَجِدِ اَلْمَاءَ } 1 . 1 – صحيح. رواه مسلم (522)، وأوله: “فضلنا على الناس بثلاث: جعلت صفوفنا كصفوف الملائكة، وجعلت…” الحديث.

In another narration by Hudhaifah (RAA): “And the soil of the earth had been made for us as a means with which to purify ourselves (for prayer), when we cannot find water.” Related by Muslim.