صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب الركعتين قبل الفجر وما فيها من السننChapters on Two Rak‘ahs before Fajr and their Sunnahs
(477) بَابُ النَّهْيِ عَنْ أَنْ يُصَلِّيَ رَكْعَتَيِ الْفَجْرِ بَعْدَ الْإِقَامَةِ،The chapter on the prohibition of praying the two units before Fajr after the iqamah
Hadith Q1123
ضِدَّ قَوْلِ مَنْ زَعَمَ أَنَّهُمَا تُصَلَّيَانِ وَالْإِمَامُ يُصَلِّي الْفَرِيضَةَ
Contrary to the statement of the person who says that they can be performed while the Imam is performing the obligatory prayer.
