وَ مَا تَفَرَّقَ الَّذِیۡنَ اُوۡتُوا الْکِتٰبَ اِلَّا مِنۡۢ بَعْدِ مَا جَآءَتْہُمُ الْبَیِّنَۃُ ؕ﴿۴﴾
Nor did the People of the Book(s) get divided until after the clear proof came to them.
Tafsir al-Tabari تفسیر الطبری
The jews and Christians were not divided about the Holy Prophet – may Allah send peace and blessings upon him – but they falsified him only after came to them i.e. to the jews and Christians, the clear proof i.e. the Holy Prophet Muhammad – may Allah send peace and blessings upon him – that he is indeed the Messenger of Allah appointed by Allah upon His creation. Allah Almighty states that when Allah appointed him, they became divided about it, so some of them did not believe in him and some did whereas they were unanimously of the opinion that he is a Prophet prior to his appointment.
Tafsir Al-Tabari (Tafsir Ibn Jareer / Jame’ al-Bayaan fi Taweel al-Quraan) of Imam Abu Ja’far Muhammad ibn Jareer al-Tabri t D. 310 A.H.
Tafsir al-Jalalain تفسیر الجلالین
{وَمَا تَفَرَّقَ الَّذِينَ أُوتُوا الْكِتَاب} فِي الْإِيمَان بِهِ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ {إِلَّا مِنْ بَعْد مَا جَاءَتْهُمْ الْبَيِّنَة} أَيْ هُوَ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ أَوْ الْقُرْآن الْجَائِي بِهِ مُعْجِزَة لَهُ وَقَبْل مَجِيئِهِ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ كَانُوا مُجْتَمِعِينَ عَلَى الْإِيمَان بِهِ إِذَا جَاءَهُ فَحَسَدَهُ مَنْ كَفَرَ بِهِ مِنْهُمْ
And those who were given the Scripture did not become divided, regarding their belief in him [the Holy Prophet – may Allah send peace and blessings upon him] except after the clear proof had come to them i.e. the Holy Prophet – may Allah send peace and blessings upon him — or the Quran which he brought as his miracle. Before his arrival, they had all agreed to believe in him when he would come; then those who disbelieved in him from amongst them became envious of him.
Tafsir al-Jalalain of Imam Jalaaluddin Muhammad ibn Ahmad al-Mahalli al-Shafe’i t D. 864 A.H. and Imam Jalaaluddin Abd al-Rahman ibn Abi Bakr al-Suyooti al-Shafe’i t D. 911 A.H.
MUSJIDUL HAQ 
Leave a comment