Clarifying the usage of the word Kafir for one who abandons Salat Sahih Muslim 81 b
Arabic hadith text
حَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا الأَعْمَشُ، بِهَذَا الإِسْنَادِ مِثْلَهُ غَيْرَ أَنَّهُ قَالَ " فَعَصَيْتُ فَلِيَ النَّارُ
Translation
A'mash narrated this hadith with the same chain of transmitters, with this change of words that he (the Satan) said
I disobeyed and I am doomed to Hell.