فَإِن كَذَّبوكَ فَقَد كُذِّبَ رُسُلٌ مِن قَبلِكَ جاءوا بِالبَيِّناتِ وَالزُّبُرِ وَالكِتابِ المُنيرِ

If they reject you, so were messengers before you also rejected. They came with clear signs, scriptures, and the Enlightening Book.