(51) باب الْحَثِّ عَلَى الْمُبَادَرَةِ بِالأَعْمَالِ قَبْلَ تَظَاهُرِ الْفِتَنِ
It is narrated on the authority of Abu Huraira that the Messenger of Allah (ﷺ) observed:
Be prompt in doing good deeds (before you are overtaken) by turbulence which would be like a part of the dark night. During (that stormy period) a man would be a Muslim in the morning and an unbeliever in the evening or he would be a believer in the evening and an unbeliever in the morning, and would sell his faith for worldly goods.
Reference: Sahih Muslim 118
In-book reference: Book 1, Hadith 220
USC-MSA web (English) reference(deprecated numbering scheme): Book 1, Hadith 213