Sunan an-Nasa'i, Volume 3, Book 24, Hadith 2775 (DarusSalam) ⓘ
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: Hadith 2773 (Reference) & Book 24, Hadith 0 (In-Book)