Al-Matalib al-'Aliyah 3650 — Surah al-Isra

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he said: "Allah, the Mighty and Majestic, revealed this word on the blessed tongue of your Prophet (peace and blessings be upon him) in this way: 'wa wassa rabbuka alla ta'budu illa iyyahu', meaning: 'And your Lord has enjoined that you worship none but Him.' Then (in the script) one of the two letters 'waw' became joined to the other, because of which people recited it to us in this way: "And your Lord has decreed that you worship none but Him" [Surah al-Isra': 23]. Yet if this command had been revealed as a definitive, cosmic decree (qada'), no one would have associated partners with Allah (because Allah's cosmic decree is unalterable)." Maymun bin Mihran (may Allah have mercy on him) used to say: "Indeed, there is a special light of truth upon this interpretation," and the saying of Allah, the Blessed and Exalted, is: "He has ordained for you of religion what He enjoined upon Nuh" [Surah al-Shura: 13].
Imam Ahmad bin Mani' narrated it. Its chain contains a narrator named Furat bin al-Sa'ib, who is weak, while the authentic and mutawatir (mass-transmitted) reading of the Noble Qur'an is "wa qada", which here means "amara", that is, to command.