"They will soon come to know who is weakest in helper," meaning: You, O polytheists, have no helper. "And fewest in number," meaning: Every human being will be isolated with his deeds.
﴿فسيعلمون من أَضْعَف ناصرا﴾ أَيْ: أَنَّكُمْ أَيُّهَا الْمُشْرِكُونَ لَا نَاصِر لكم ﴿وَأَقل عددا﴾ أَيْ: يُفْرَدُ كُلُّ إِنْسَانٍ بِعَمَلِهِ.