Language:
كتاب الحج
25  
Hajj (Pilgrimage)
(98)
Chapter: Whosoever sent the weak amongst his family (women and children) early (from Al-Muzdalifa to Mina) at night after the moon had set. They stayed at Al Muzdalifa and invoked Allah there and proceeded from there when the moon had set
(98)
باب مَنْ قَدَّمَ ضَعَفَةَ أَهْلِهِ بِلَيْلٍ، فَيَقِفُونَ بِالْمُزْدَلِفَةِ وَيَدْعُونَ وَيُقَدِّمُ إِذَا غَابَ الْقَمَرُ
Sahih al-Bukhari 1680

Narrated `Aisha:

Sauda asked the permission of the Prophet (ﷺ) to leave earlier at the night of Jam', and she was a fat and very slow woman. The Prophet (ﷺ) gave her permission.

حَدَّثَنَا مُحَمَّدُ بْنُ كَثِيرٍ، أَخْبَرَنَا سُفْيَانُ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ ـ هُوَ ابْنُ الْقَاسِمِ ـ عَنِ الْقَاسِمِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتِ اسْتَأْذَنَتْ سَوْدَةُ النَّبِيَّ صلى الله عليه وسلم لَيْلَةَ جَمْعٍ وَكَانَتْ ثَقِيلَةً ثَبْطَةً فَأَذِنَ لَهَا‏.‏
Reference : Sahih al-Bukhari 1680
In-book reference : Book 25, Hadith 160
USC-MSA web (English) reference : Vol. 2, Book 26, Hadith 740
  (deprecated numbering scheme)