Sayyiduna Abu Dharr Ghifari (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: "When a person stands for prayer, mercy is facing him, so he should not wipe his hand over the pebbles." Sufyan says: Sa‘d bin Ibrahim asked him: Who is Abu’l-Ahwas? It is as if Sa‘d expressed displeasure at Zuhri for narrating a hadith from an unknown person whom he did not know, so Zuhri said to him: Do you not know that elderly slave of Banu Ghifar who used to pray in the garden? So Zuhri kept describing him, but Sa‘d bin Ibrahim could not recognize him.