That book is (The Book of Traditions).
Sharing a valuable resource for students of knowledge: kitaab-ul-aathaar pdf
The text is systematically organized into chapters covering all aspects of Islamic life and law, including: Kitab al Athar By Qadhi Imam Abu Yusuf - Internet Archive That book is (The Book of Traditions)
Detailed rulings on wudu, ghusl, and water purity. kitaab-ul-aathaar pdf
You can search for "Kitab al-Athar pdf" online or visit websites like archive.org, google books, or islamic libraries to access the PDF version of the book.