مسائل المنتخبه (Articles Of Islamic Acts) - الخوئي، السيد أبوالقاسم - الصفحة ٢١٨ - QIYAM (TO STAND)

prayers, although that prayers may have become obligatory on account of vow (Nazr) However, as regardssome recommended prayers like Wahshat prayers in which a particular surah is to be recited if a person wishes to act according to the orders prescribed for that prayers, heshould recite the same surah
٩٩٦. While offering Friday prayers or midday prayers on Friday it is recommended that after reciting Surah al-Hamd Surah alJumuah should be recited in the firstunit, and Surah al-Munafiqin in the second unit. and in case a person begins reciting one of these surahs he is not allowed to abandon it and recite another surah in itsplace.
٩٩٧. If after Hamd somebody begins reciting the Surah Qul Howallah or Qul ya ayyuhal Kafiroon he cannot abandon it and recite some other surah However, if in Fridayprayers and in midday prayers on Friday, he recites one of these surahs owing to forgetfulness instead of surah Jumnah and Surah Munafiqin he can abandon it and recite SurahJumuah and Surah Munafiqin and precaution is that he should not abandon that surah after he has recited more than half of it.
٩٩٨. If a person recites intentionally Surah Qul Huwallah or Surah Qul ya ayyuhal Kafiroon in Friday prayers or in midday prayers on Friday he cannot on the basisof obligatory precaution abandon it and recite Surah Jumuah and Surah Munafiqin even though he may not have reached half of it.
٩٩٩. If, while offering prayers, a person recites a surah other than Surah Qul Howallah and Surah Qul ya ayyuhol Kafiroon he can abandon that surah before reachinghalf of it and recite some other surah and on the basis of precaution he should not abandon it between its half and two-third and when he reaches its two-third abandoning itand resorting to another surah is not permissible.
١٠٠٠. If the person offering prayers forgets a part of a surah or cannot complete it owing to helplessness e.g. on account of