The following narration is found in Imam Suyuti's book "Itqan Fi 'Ulum Al-Qur'an". This narration has been classified as "Sahih" by Imam Suyuti in Al-Itqaan (page no.1236)
Hishaam Ibn Urwah narrated from his father:-
I asked Ayesha (Radhi'allahu'anha) about the grammatical mistakes in the Qur’an: “Surely, those who believe, those who are the Jews and the Sabians [wa’s-saabi’oona]” [al-Maa’idah 5:69]; “and those who perform As-Salaah (Iqaamat-as-Salaah) wa muqeemeena as-salaata wa’l-mu’toona az-zakaata” [an-Nisa’ 4:162]; and “Certainly! these are two magicians [inna haadhaani la saahiraan]” [Taa-Haa 20:63]. She (Ayesha) said: O son of my sister! These are the mistakes of the scribes. They made a mistake when writing (The Qur'an).
This narration is also found in the following collections of Islamic literature:-
Tafsir At-Tabari (9/359)
Ibn Abi Dawud's Kitab Al-Masahif (page no. 43)
It was also narrated through Abu Ubayd in Fada'ail Al-Qur’an (page no.229 and page no.556)
It was narrated through Abu Ubayd to Abu Amr Ad-Daani in Kitab Al-Muqni (Page no. 119)
I think this narration is also found in the Sunan of Sa'eed Ibn Mansur (4/1507, no.769)
This narration was also narrated by Ali Ibn Mas-haar Al-Kufi and Umar Ibn Shubbah with their own chain of narrators in Tarikh Al-Madina [See Tarikh Al-Madina, (3/1013-1014)]
This narration has been clasiffied as Sahih by Imam Suyuti. I want to know why Imam Suyuti classified it as Sahih in Al-Itqaan (page no.1236)? Does this narration prove that there are any grammatical errors in the Glorious Qur'an (May God Forbid)?