"Indeed, they were a blind people," meaning they were blind to the truth.
Surah Al-A'raf from verse (65) to verse (72).
﴿إِنَّهُم كَانُوا قوما عمين﴾ عموا عَن الْحق.
سُورَة الْأَعْرَاف من الْآيَة (٦٥) إِلَى الْآيَة (٧٢).