343 - حَدَّثَنَا الْحُمَيْدِيُّ قَالَ: ثنا سُفْيَانُ قَالَ: ثنا عُبَيْدُ اللَّهِ بْنُ أَبِي يَزِيدَ قَالَ: سَمِعْتُ أَبِي يَقُولُ: نَزَلْتُ عَلَي أُمِّ أَيُّوبَ الْأَنْصَارِيَّةِ فَأَخْبَرَتْنِي أَنَّ رَسُولَ اللَّهِ صَلَّي اللهُ عَلَيْهِ وَسَلَّمَ قَالَ: «نَزَلَ الْقُرْآنُ عَلَي سَبْعَةِ أَحْرُفٍ أَيَّهَا قَرَأْتَ أَصَبْتَ»
Ubaidullah bin Abu Yazid narrates from his father: I stayed with Sayyida Umm Ayyub Ansariyyah (may Allah be pleased with her), so she told me, the Prophet Muhammad (peace and blessings be upon him) said: "The Qur'an was revealed upon seven modes (ahruf); whichever of them you recite will be correct."