إِنَّ اللَّهَ لَا يَقْبِضُ الْعِلْمَ انْتِزَاعًا يَنْتَزِعُهُ مِنَ الْعِبَادِ، وَلَكِنْ يَقْبِضُ الْعِلْمَ بِقَبْضِ الْعُلَمَاءِ، حَتَّى إِذَا لَمْ يَبْقَ عَالِمًا اتَّخَذَ النَّاسُ رُؤُوسًا جُهَّالًا، فَسُئِلُوا فَأَفْتَوْا بِغَيْرِ عِلْمٍ، فَضَلُّوا وَأَضَلُّوا
Translation: Allah will not remove knowledge by suddenly snatching it from people, but will remove it through the passing of scholars. When no scholar remains, people will take ignorant leaders, who will be asked questions and give rulings without knowledge, going astray and leading others astray.
لَا يَقْبِضُ الْعِلْمَ انْتِزَاعًا negates the idea of knowledge being suddenly extracted. In contrast, وَلَكِنْ يَقْبِضُ الْعِلْمَ بِقَبْضِ الْعُلَمَاءِ describes the loss of scholars and consequent loss of access to sound knowledge.
If people lacking sufficient training replace scholars as religious authorities, harm may follow in two directions: mistaken understanding and misleading answers given to others.