Chapter on Virtues of Hajj
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 3|Chapter 2
وَ قَالَ أَبُو جَعْفَرٍ عَلَيْهِ اَلسَّلاَمُ: «إِنَّمَا اِسْتَحْسَنُوا إِشْعَارَ اَلْبُدْنِ لِأَنَّ أَوَّلَ قَطْرَةٍ تَقْطُرُ مِنْ دَمِهَا يَغْفِرُ اَللَّهُ لَهُ عَلَى ذَلِكَ ».
Abu Ja’far عليه السلام said: "The practice of marking the sacrificial animal (Ish’ar) was deemed good because at the very first drop of its blood that falls, Allah سبحانه وتعالى forgives the person for that act."
- Ṣaḥīḥ al-Faqīh