Mishkat al-Masabih 4 Prayer كتاب الصلاة 590

وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ صَلَّى بَعْدَ الْمَغْرِبِ سِتَّ رَكَعَاتٍ لَمْ يَتَكَلَّمْ فِيمَا بَيْنَهُنَّ بِسُوءٍ عُدِلْنَ لَهُ بِعِبَادَةِ ثِنْتَيْ عَشْرَةَ سَنَةً» . رَوَاهُ التِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ غَرِيبٌ لَا نَعْرِفُهُ إِلَّا مِنْ حَدِيثِ عمر بن أَبِي خَثْعَمٍ وَسَمِعْتُ مُحَمَّدَ بْنَ إِسْمَاعِيلَ يَقُولُ: هُوَ مُنكر الحَدِيث وَضَعفه جدا

Abu Huraira reported God’s Messenger as saying, “If anyone prays six rak’as after the sunset prayer, not saying anything evil during them, they will be treated for him as equivalent to twelve years’ worship.” Tirmidhi transmitted it, saying, “This is a gharib tradition which I know only from the traditions of ‘Umar b. Abu Khath’am; and I heard Muhammad b. Isma’il (i.e. Bukhari) say that his traditions are rejected. He declared him to be very weak.”