Sunan an-Nasa'i, Hadith 2773 ⓘ
It was narrated from Ibn Abbas: That the Prophet marked his Budn on the right side and the blood flowed down and marked it.
أَخْبَرَنَا مُجَاهِدُ بْنُ مُوسَى، عَنْ هُشَيْمٍ، عَنْ شُعْبَةَ، عَنْ قَتَادَةَ، عَنْ أَبِي حَسَّانَ الأَعْرَجِ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم أَشْعَرَ بُدْنَهُ مِنَ الْجَانِبِ الأَيْمَنِ وَسَلَتَ الدَّمَ عَنْهَا وَأَشْعَرَهَا .
also referenced under: Book 24, Hadith 0 (In-Book) & Volume 3, Book 24, Hadith 2775 (DarusSalam)