أَخْبَرَنَا مُحَمَّدُ بْنُ يُوسُفَ، حَدَّثَنَا سُفْيَانُ، عَنْ يُونُسَ بْنِ عُبَيْدٍ، عَنْ الْحَسَنِ، عَنْ عُثْمَانَ بْنِ أَبِي الْعَاصِ أَنَّهُ كَانَ "لَا يَقْرَبُ النُّفَسَاءَ أَرْبَعِينَ يَوْمًا"، وقَالَ الْحَسَنُ: "النُّفَسَاءُ خَمْسَةٌ وَأَرْبَعُونَ إِلَى خَمْسِينَ، فَمَا زَادَ فَهِيَ مُسْتَحَاضَةٌ".
Uthman bin Abi al-As would not go near a woman in postpartum bleeding for forty days (i.e., he would abstain from intercourse). And Imam Hasan, may Allah have mercy on him, said: Women in postpartum bleeding are from forty-five to fifty days, after that they will be considered as mustahadah (women with irregular bleeding).