عَنْ أَبِي هُرَيْرَةَ رضي الله عنه أَنَّ رَسُولَ اللهِ قَالَ: «بَادِرُوا بِالْأَعْمَالِ فِتَنًا كَقِطَعِ اللَّيْلِ الْمُظْلِمِ، يُصْبِحُ الرَّجُلُ مُؤْمِنًا وَيُمْسِي كَافِرًا، أَوْ يُمْسِي مُؤْمِنًا وَيُصْبِحُ كَافِرًا، يَبِيعُ دِينَهُ بِعَرَضٍ مِنَ الدُّنْيَا» 

Abu Hurayrah narrated that God’s Messenger (peace be upon him) said: 

1. Hasten to do good deeds before troubles come thick like patches of night darkness,  2. when a man may be a believer in the morning and becomes an unbeliever in the evening, or may be a believer in the evening, then become an unbeliever in the morning.  3. He sells his faith for some worldly gain.

Related by Muslim, 118.

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