Ibn Abbas reported: The Prophet, peace and blessings be upon him, said, “The most hated of people to Allah are three persons: a person who deviates into the unlawful, a person who seeks for the traditions of ignorance to remain in Islam, and a person who seeks to shed the blood of another without a just cause.”
Source: Ṣaḥīḥ al-Bukhārī 6488
Grade: Sahih (authentic) according to Al-Bukhari
عَنْ ابْنِ عَبَّاسٍ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ أَبْغَضُ النَّاسِ إِلَى اللَّهِ ثَلَاثَةٌ مُلْحِدٌ فِي الْحَرَمِ وَمُبْتَغٍ فِي الْإِسْلَامِ سُنَّةَ الْجَاهِلِيَّةِ وَمُطَّلِبُ دَمِ امْرِئٍ بِغَيْرِ حَقٍّ لِيُهَرِيقَ دَمَهُ
6488 صحيح البخاري كتاب الديات باب من طلب دم امرئ بغير حق