صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب الأذان والإقامةChapters on Adhan and Iqamah
(97) بَابُ ذِكْرِ الدَّلِيلِ [عَلَى أَنَّ] الْخِدَاجَ الَّذِي أَعْلَمَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي هَذَا الْخَبَرِ هُوَ النَّقْصُ الَّذِي لَا تُجْزِئُ الصَّلَاةُ مَعَهُ،Chapter 97: Evidence that the deficiency mentioned by the Prophet is a shortcoming that invalidates the prayer
Hadith Q490
إِذِ النَّقْصُ فِي الصَّلَاةِ يَكُونُ نَقْصَيْنِ، أَحَدُهُمَا لَا تُجْزِئُ الصَّلَاةُ مَعَ ذَلِكَ النَّقْصِ، وَالْآخَرُ تَكُونُ الصَّلَاةُ جَائِزَةً مَعَ ذَلِكَ النَّقْصِ لَا يَجِبُ إِعَادَتُهَا، وَلَيْسَ هَذَا النَّقْصُ مِمَّا يُوجِبُ سَجْدَتَيِ السَّهْوِ مَعَ جَوَازِ الصَّلَاةِ.
Because there are two types of deficiencies in prayer: one deficiency is such that, if present, the prayer is not sufficient; the other deficiency is such that, with it, the prayer becomes valid, and repeating it is not obligatory, and this is not the deficiency that, along with the prayer being valid, makes two prostrations of forgetfulness obligatory.
