Chapter: Sungguh-sungguh di sepuluh akhir bulan ramadhan
A chapter in the Book of Retiring to a Mosque for Remembrance of Allah (I'tikaf), Shahih Muslim. 2 hadith. Chapter title in Indonesian.
كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا دَخَلَ الْعَشْرُ أَحْيَا اللَّيْلَ وَأَيْقَظَ أَهْلَهُ وَجَدَّ وَشَدَّ الْمِئْزَرَ
A'Isha (Allah be pleased with her) reported that when the last ten nights began Allah's Messenger (may peace be upon him) kept awake at night (for prayer and devotion), wakened his family, and prepared himself to observe prayer (with more vigour).
Muslim 2008
كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَجْتَهِدُ فِي الْعَشْرِ الْأَوَاخِرِ مَا لَا يَجْتَهِدُ فِي غَيْرِهِ
A'isha (Allah be pleased with her) reported that Allah's Messenger (may peace be upon him) used to exert himself in devotion during the last ten nights to a greater extent than at any other time.
Muslim 2009