﴿ قَالُوٓا۟ إِنَّكُمْ كُنتُمْ تَأْتُونَنَا عَنِ ٱلْيَمِينِ ﴾

“Some [of them] will say: “Behold, you were wont to approach us [deceptively] from the right!””

They that is the followers among them will say to those whom they followed ‘Indeed you used to approach us from the right’ in other words from that aspect in which we used to trust you for you used to swear that you followed the truth and so we believed you and we followed you — in other words ‘Indeed you have led us astray!’