"And those who join that which Allah has commanded to be joined." The interpretation of Ibn Abbas: That which Allah has commanded to be joined is faith in all the prophets; we do not differentiate between any one of them.
﴿وَالَّذِينَ يَصِلُونَ مَا أَمَرَ اللَّهُ بِهِ أَن يُوصل﴾ تَفْسِيرُ ابْنِ عَبَّاسٍ: الَّذِي أَمَرَ اللَّهُ بِهِ أَنْ يُوصَلَ: الإِيمَانُ بِالنَّبِييِّنَ كُلِّهِمْ لَا نُفَرِّقُ بَيْنَ أحدٍ مِنْهُم