Musannaf Ibn Abi Shaybah 1688 — How tayammum is performed

Ata said: Once Sayyiduna Abu Dharr (may Allah be pleased with him) was at a distance of three days' journey from the Prophet (peace and blessings be upon him) when he became junub. Then he came to the Prophet (peace and blessings be upon him), who, having finished the Fajr prayer, had gone out to relieve himself. Then he turned towards Abu Dharr, struck his hands on the dust and wiped them over his face and his palms.