٤ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ الْحُسَيْنِ وَصَفْوَانَ بْنِ يَحْيَى وَعَلِيِّ بْنِ الْحَكَمِ عَنِ الْعَلاءِ بْنِ رَزِينٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَحَدِهِمَا (عَلَيْهِما السَّلاَم) قَالَ الْغُسْلُ فِي لَيَالٍ مِنْ شَهْرِ رَمَضَانَ فِي تِسْعَ عَشْرَةَ وَإِحْدَى وَعِشْرِينَ وَثَلاثٍ وَعِشْرِينَ وَأُصِيبَ أَمِيرُ الْمُؤْمِنِينَ صَلَوَاتُ الله عَلَيْهِ فِي لَيْلَةِ تِسْعَ عَشْرَةَ وَقُبِضَ فِي لَيْلَةِ إِحْدَى وَعِشْرِينَ صَلَوَاتُ الله عَلَيْهِ قَالَ وَالْغُسْلُ فِي أَوَّلِ لَيْلَةٍ وَهُوَ يُجْزِئُ إِلَى آخِرِهِ. 
4. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn and Safwan ibn Yahya and Ali ibn al-Hakam from al-‘Ala’ ibn Razin from Muhammad ibn Muslim who has said the following: “One of the two Imam, ‘Alayhim al-Salam, has said, ‘One should take a shower in the nineteenth, twenty-first and twenty-third nights of the month of Ramadan. ’Amir al-Mu’minin , sustained a mortal wound by an assassin in the nineteenth night. He (the Imam) passed away on the twenty-first night of the month of Ramadan. A shower should be taken at the beginning of the night and it is enough until the end of the night.” 