The Book of Fasting
13/26. Chapter:
It is Permissible to delay making up missed Ramadan Fasts until before the next Ramadan comes, and this is for those who broke the fast for a reason such as sickness, travel, menstruation and the like
Sahih Muslim
وَحَدَّثَنِيهِ مُحَمَّدُ بْنُ رَافِعٍ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، حَدَّثَنِي يَحْيَى، بْنُ سَعِيدٍ بِهَذَا الإِسْنَادِ وَقَالَ فَظَنَنْتُ أَنَّ ذَلِكَ لِمَكَانِهَا مِنَ النَّبِيِّ صلى الله عليه وسلم . يَحْيَى يَقُولُهُ .
In another version of the previous hadith, the words are: " Yahya said: I think it was due to the regard for the Messenger of Allah (ﷺ)."
Reference : Sahih Muslim 1146cIn-book reference : Book 13, Hadith 195USC-MSA web (English) reference : Book 6, Hadith 2550