وقال صلى الله عليه وآله: لا غرار في صلاة ولا تسليم. الغرار النقصان، أما في الصلاة ففي ترك إتمام ركوعها وسجودها ونقصان اللبث في ركعة عن اللبث في الركعة الأخرى، ومنه قول الصادق عليه السلام: " الصلاة ميزان، من وفى استوفى " ومنه قول النبي صلى الله عليه وآله: " الصلاة مكيال فمن وفى وفي له ". فهذا الغرار في الصلاة، وأما الغرار في التسليم فأن يقول الرجل: السلام عليك [أ] ويرده فيقول: وعليك، ولا يقول: وعليكم السلام. ويكره تجاوز الحد في الرد كما يكره الغرار، وذلك أن الصادق عليه السلام سلم على رجل فقال له الرجل: وعليكم السلام ورحمة الله وبركاته ومغفرته ورضوانه. فقال: لا تجاوزوا بنا قول الملائكة لأبينا إبراهيم عليه السلام: " رحمة الله وبركاته عليكم أهل البيت إنه حميد مجيد ".
He, Allah’s blessings be upon him and his Family, also said: «There shall be no hasting in (performance of) prayer nor the sending of peace.» To haste is to cause (some) shortening. As for prayer, it is (perfomed) in (the acts of) abandoning the completion of its kneeling, prostration and shortening the lingering in one rak’a from lingering in another rak’a. From this, its transmitted of al-Sadiq, peace be upon him: «The prayer is a scale of measurement; the one who fulfils, shall be fulfilled.» From this is also the saying of the Prophet, Allah’s blessings be upon him and his Family: «The prayer is a gauge; the one who fulfils, to him shall it be fulfilled.» This is with regards to haste during prayer. As for haste during the sending of peace, it is that a man says: «Peace be upon you [1]» or that he responds to it and says: «And upon you [2]», and that he does not say: «And upon you [3] be peace». It is disliked to exceed the limitation during response, like how it is disliked to haste (by shortening). That is because al-Sadiq, peace be upon him, sent peace upon a man, to which the man said: «And upon you is peace and the mercy of Allah, and His blessings, forgivenesses and satisfaction». He then said: «Do not exceed with us the saying of the Angels to our father, Ibrahim, peace be upon him: The mercy of Allah and His blessings be upon you, the Household. He is, indeed, Praiseworthy, Commendable.» (11:73)