The Prophet ﷺ said: At the end of time there will be people who will use this black dye like the crops of doves who will not experience the fragrance of Paradise. (Using translation from Abū Dāʾūd 4212)
قَالَ رَسُولُ اللهِ ﷺ «يَكُونُ فِي آخِرِ الزَّمَانِ قَوْمٌ يَخْضِبُونَ بِالسَّوَادِ كَحَوَاصِلِ الطَّيْرِ لَا يَرِيحُونَ رَائِحَةَ الْجَنَّةِ»