Riyad as-Saliheen 1845
Ibn Mas'ud (May Allah be pleased with him) reported:
The Prophet ﷺ said, "The first matter concerning which people will be judged on the Day of Resurrection will be the matter of blood."
[Al-Bukhari and Muslim].
وعن ابن مسعود رضي الله عنه قال: قال النبي ﷺ :
"أول ما يقضى بين الناس يوم القيامة في الدماء" ((متفق عليه)).
Classification
Sahih (Authentic)
References
Riyad as-Saliheen 1845
Riyad as-Saliheen Book of Miscellaneous ahadith of Significant Values, Hadith 38