1. Purification
١۔ كِتَابُ الطَّهَارَةِ
"Umar mentioned to the Messenger of Allah ﷺ that he became Junub at night, and the Messenger of Allah ﷺ said: 'Perform Wudu' and wash you penis, then sleep.'" (Using translation from Nasāʾī 260)
ذَكَرَ عُمَرُ لِرَسُولِ اللهِ ﷺ أَنَّهُ تُصِيبُهُ جَنَابَةٌ مِنَ اللَّيْلِ فَقَالَ رَسُولُ اللهِ ﷺ «تَوَضَّأْ وَاغْسِلْ ذَكَرَكَ ثُمَّ نَمْ»