[Machine] Al-Hasan al-Basri and Qatadah, and the discussion regarding them, relates to the recommendation of performing purification during the remembrance of Allah. This has been previously mentioned in the book of purification.
الْحَسَنُ الْبَصْرِيُّ وَقَتَادَةُ وَالْكَلَامُ فِيهِ يَرْجِعُ إِلَى اسْتِحْبَابِ الطَّهَارَةِ فِي الْأَذْكَارِ وَقَدْ مَضَى فِي كِتَابِ الطَّهَارَةِ