And he knew that they would not reach him. "And He supported him with soldiers you did not see," meaning the angels, during his fighting against the polytheists.
Surah al-Tawbah from verse (41) to verse (42).
وَعَلِمَ أَنَّهُمْ غَيْرُ وَاصِلِينَ إِلَيْهِ ﴿وأيده بِجُنُود لم تَرَوْهَا﴾ يَعْنِي: الْمَلائِكَةَ عِنْدَ قِتَالِهِ الْمُشْرِكِينَ.
سُورَة التَّوْبَة من الْآيَة (٤١) إِلَى الْآيَة (٤٢).