ك انَ فِي العَهدِ القَدِيْمِ رُؤَساءُ كَهَنَةٍ كَثِيْرُونَ. وَكُلَّما ماتَ أحَدُهُمْ، كانَ لا بُدَّ مِنَ استِبدالِهِ.
Also there were many priests, because they were prevented by death from continuing.