A freed slave of Hazrat Abu Sa'id Khudri (may Allah be pleased with him) says that once I entered the mosque with Hazrat Abu Sa'id (may Allah be pleased with him) in the company of the Prophet (peace and blessings be upon him). In the middle of the mosque, a man was sitting with his knees drawn up and had interlaced the fingers of his hands. The Prophet (peace and blessings be upon him) gestured to him to stop, but he did not understand the gesture of the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) turned to Hazrat Abu Sa'id (may Allah be pleased with him) and said: When any one of you is in the mosque, he should not interlace his fingers, because this is a satanic act. And as long as a person remains in the mosque, until he leaves the mosque, he is counted among those who are offering prayer.