H 156 H "If the Prophet, praise and peace be upon him, missed his voluntary prayer during the night due to something such as illness he would offer twelve units of prayer during the day." R 156 Muslim with a chain up to the Mother of Believers, Lady Ayesha who related this.
155- وعن عائشة رضي الله عنها ، قَالَتْ : كَانَ رَسُول الله صلى الله عليه وآله وسلم إِذَا فَاتَتْهُ الصَّلاةُ مِنَ اللَّيلِ مِنْ وَجَعٍ أَوْ غَيرِهِ، صَلَّى مِنَ النَّهارِ ثنْتَيْ عَشرَةَ رَكْعَةً . رواه مسلم .