The Book of Purification
1/142. Chapter:
Ghusl At The Beginning And End Of The Night
Sunan an-Nasai
أَخْبَرَنَا يَحْيَى بْنُ حَبِيبِ بْنِ عَرَبِيٍّ، قَالَ حَدَّثَنَا حَمَّادٌ، عَنْ بُرْدٍ، عَنْ عُبَادَةَ بْنِ نُسَىٍّ، عَنْ غُضَيْفِ بْنِ الْحَارِثِ، قَالَ دَخَلْتُ عَلَى عَائِشَةَ رضى الله عنها فَسَأَلْتُهَا قُلْتُ أَكَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَغْتَسِلُ مِنْ أَوَّلِ اللَّيْلِ أَوْ مِنْ آخِرِهِ قَالَتْ كُلَّ ذَلِكَ رُبَّمَا اغْتَسَلَ مِنْ أَوَّلِهِ وَرُبَّمَا اغْتَسَلَ مِنْ آخِرِهِ . قُلْتُ الْحَمْدُ لِلَّهِ الَّذِي جَعَلَ فِي الأَمْرِ سَعَةً .
It was narrated that Ghudaif bin Al-Harith said: "I entered upon 'Aishah and asked her: 'Did the Messenger of Allah (ﷺ) perform Ghusl at the beginning of the night or at the end?' She said: 'Both. Sometimes he performed Ghusl at the beginning and sometimes at the end.' I said: 'Praise be to Allah who has made the matter flexible.'"
Reference : Sunan an-Nasa'i 223In-book reference : Book 1, Hadith 224English translation : Vol. 1, Book 1, Hadith 224