(22) باب أُنْزِلَ الْقُرْآنُ عَلَى سَبْعَةِ أَحْرُفٍ
Al-Zuhri said:
These modes of reading aimed at the same point, not different in respect of lawful and unlawful. (ID)
Reference (ID): Sunan Abi Dawud 1476 (ID)
In-book reference (ID): Book 8, Hadith 61 (ID)
English translation (ID): Book 8, Hadith 1471 (ID)