Looking for some clarification for ayah 2:45 and 2:56

>وَإِذْ قَالَ مُوسَىٰ لِقَوْمِهِ يَا قَوْمِ إِنَّكُمْ ظَلَمْتُمْ أَنفُسَكُم بِاتِّخَاذِكُمُ الْعِجْلَ فَتُوبُوا إِلَىٰ بَارِئِكُمْ فَاقْتُلُوا أَنفُسَكُمْ ذَٰلِكُمْ خَيْرٌ لَّكُمْ عِندَ بَارِئِكُمْ فَتَابَ عَلَيْكُمْ ۚ إِنَّهُ هُوَ التَّوَّابُ الرَّحِيمُ And [recall] when Moses said to his people, "O my people, indeed you have wronged yourselves by your taking of the calf [for worship]. So repent to your Creator and kill yourselves. That is best for [all of] you in the sight of your Creator." Then He accepted your repentance; indeed, He is the Accepting of repentance, the Merciful. 2:54 From reading this I understood that Allah called those disbelievers to kill themselves? Two verses later >ثُمَّ بَعَثْنَاكُم مِّن بَعْدِ مَوْتِكُمْ لَعَلَّكُمْ تَشْكُرُونَ Then We revived you after your death that perhaps you would be grateful. 2:56 Could someone please explain me what is happening here? Thank you.