The Muslim should not let the Shaytan have any control over him, or let him cause him to become confused about his worship to the extent that he thinks that what is recommended is obligatory, and the like. In this hadith, Ibn Mas‘ud (may Allah be pleased with him) advises his companions not to give the Shaytan any share of their prayer. That was because they used to see the Prophet (blessings and peace of Allah be upon him), after he got up following prayer, leaving to the right, so they thought that leaving to the right was obligatory, and that leaving to the left was not permissible. So Ibn Mas‘ud (may Allah be pleased with him) wanted to make it clear to them that there was nothing wrong with leaving to the left, and that on many occasions he saw the Prophet (blessings and peace of Allah be upon him) leaving to his left after the prayer. That was because Ibn Mas‘ud feared that this would become something that had to be done in this manner and it would be thought that nothing else was permissible. The Prophet (blessings and peace of Allah be upon him) used to leave to the right in most cases because he liked to start with the right-hand side in all his affairs. This hadith indicates that leaving to the right and the left are both permissible, and there is nothing wrong with either of them..