<p style='text-align: justify;'>Halakhic work dealing with impurity, possibly attributed to Saʿadya Gaʾon. Chapter headings (al-daraja al-ṯāliṯa, al-daraja al-tāsiʿa, al-daraja al-ʿāšira, al-bāb al-rābiʿ, al-bāb al-ṯāmin, etc.) are written in large letters.</p>