Sahih al-Bukhari 63:132
Narrated Asma:
I prepared the journey food for the Prophet (ﷺ) and Abu Bakr when they wanted (to migrate to) Medina. I said to my father (Abu Bakr), "I do not have anything to tie the container of the journey food with except my waist belt." He said, "Divide it lengthwise into two." I did so, and for this reason I was named 'Dhat-un-Nitaqain' (i.e. the owner of two belts). (Ibn `Abbas said, "Asma', Dhat-un-Nitaq.")
Reference
Sahih al-Bukhari 63:132
In-book reference
Book 63, Hadith 132
Arabic Text
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو أُسَامَةَ، حَدَّثَنَا هِشَامٌ، عَنْ أَبِيهِ، وَفَاطِمَةَ، عَنْ أَسْمَاءَ، رضى الله عنها صَنَعْتُ سُفْرَةً لِلنَّبِيِّ صلى الله عليه وسلم وَأَبِي بَكْرٍ حِينَ أَرَادَا الْمَدِينَةَ، فَقُلْتُ لأَبِي مَا أَجِدُ شَيْئًا أَرْبُطُهُ إِلاَّ نِطَاقِي. قَالَ فَشُقِّيهِ. فَفَعَلْتُ، فَسُمِّيتُ ذَاتَ النِّطَاقَيْنِ.