Abu Hurairah (may Allah be pleased with him) narrates that Abu al-Qasim (peace and blessings be upon him) said: "When any one of you prays, he should place something in front of him." And on one occasion he said: "He should place something in front of his face. If he does not find anything, then he should plant a stick. And if even a stick is not available, then he should draw a line. Then nothing that passes in front of him will harm him." Muhammad bin Mansur al-Jawaz narrated these words: "He should place something in front of his face." The rest of the narration is like the previous narration.