عَنْ عُبَادَةَ رَضِيَ اللَّهُ عَنْهُ أَنَّ أُبَيَّ بْنَ كَعْبٍ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أُنْزِلَ الْقُرْآنُ عَلَى سَبْعَةِ أَحْرُفٍ
Sayyiduna Ubayy ibn Ka'b (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: The Noble Qur'an was revealed upon seven modes of recitation.