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It was narrated that Ibn 'Abbas, who attributed it to the Prophet (ﷺ) , said: "Some people will dye their hair black like the breasts of pigeons at the end of time, but they will not even smell the fragrance of Paradise."
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا عَبْدُ الرَّحْمَنِ بْنُ عُبَيْدِ اللَّهِ الْحَلَبِيُّ، عَنْ عُبَيْدِ اللَّهِ، - وَهُوَ ابْنُ عَمْرٍو - عَنْ عَبْدِ الْكَرِيمِ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، رَفَعَهُ أَنَّهُ قَالَ " قَوْمٌ يَخْضِبُونَ بِهَذَا السَّوَادِ آخِرَ الزَّمَانِ كَحَوَاصِلِ الْحَمَامِ لاَ يَرِيحُونَ رَائِحَةَ الْجَنَّةِ " .
sunnah.com