Sunan an-Nasa'i 2773
سنن النسائي#2773Sahihأَخْبَرَنَا 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 .
It was narrated from Ibn Abbas:That the Prophet marked his Budn on the right side and the blood flowed down and marked it
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 24:155