It is narrated from Sayyiduna Ammar bin Yasir (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to say regarding tayammum: "Striking the earth once with the hands is sufficient for the face and hands." Imam Darimi (may Allah have mercy on him) said: Its chain of narration is authentic. That is, strike the earth once with the hands and wipe the face and hands.
Hadith Takhrijاس حدیث کی سند صحیح ہے، جیسا کہ امام دارمی نے فرمایا: دیکھئے: [صحيح ابن حبان 1303] ، [مسند الحميدي 144] ، [ابن الجارود 126] ، [دارقطني 182/1] وغيرهم۔