It was narrated from Ibn ‘Abbas that the Messenger of Allah (ﷺ) said:“If I live until next year, I will fast the ninth day (of Muharram) too.”
Hadith No. 1736
Sunan Ibn Majah
Gradings:
Al-Albani:
Sahih
Muhammad Fouad Abd al-Baqi:
Sahih
Shuaib Al Arnaut:
Sahih
Zubair Ali Zai:
Sahih Muslim