Hadith
حَدَّثَنَا صَالِحُ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا جَعْفَرُ بْنُ سُلَيْمَانَ، عَنْ هِشَامٍ، عَنِ الْحَسَنِ، قَالَ كَانَ يَقُولُ فِي هَذَا الْحَدِيثِ " يُصْبِحُ الرَّجُلُ مُؤْمِنًا وَيُمْسِي كَافِرًا وَيُمْسِي مُؤْمِنًا وَيُصْبِحُ كَافِرًا " . قَالَ يُصْبِحُ الرَّجُلُ مُحَرِّمًا لِدَمِ أَخِيهِ وَعِرْضِهِ وَمَالِهِ وَيُمْسِي مُسْتَحِلاًّ لَهُ وَيُمْسِي مُحَرِّمًا لِدَمِ أَخِيهِ وَعِرْضِهِ وَمَالِهِ وَيُصْبِحُ مُسْتَحِلاًّ لَهُ .
Hisham narrated that Al-Hasan would say about the Hadith:" Morning will come upon a man as a believer, who will be a disbeliever in the evening, and evening will come upon a believer, who will be a disbeliever in the morning" - he said: "Morning would come[upon a man] while his brother's blood, honor and wealth was sacred, and when evening would come, he would consider it lawful for him. And evening would come while his brother's blood, honor and wealth was sacred, and when morning would come, he would consider it lawful for him
Sahih · Ahmad Muhammad Shakir
Jami' at-Tirmidhi 2198 ·Book 33, Hadith 41·Also available on sunnah.com·