HOW TO COMPENSATE FOR A MISSED VOLUNTARY PRAYER H 1205 "If anyone is unable to offer all or part of that which is customary for him to offer during the night and he offers it at any time between the dawn and the mid-day prayer the reward is written for him as if he had offered it during the night." R 1205 Muslim with a chain up to Omar the son of Khattab who related that the Messenger of Allah, praise and peace be upon him, said this.
1182- وعن عمر بن الخطاب رضي الله عنه ، قَالَ : قَالَ رسولُ الله صلى الله عليه وآله وسلم : "مَنْ نَامَ عَنْ حِزْبِهِ ، أَوْ عَنْ شَيْءٍ مِنْهُ ، فَقَرَأَهُ فيما بَيْنَ صَلاَةِ الفَجْرِ وصلاة الظُّهْرِ ، كُتِبَ لَهُ كَأنَّمَا قَرَأهُ مِنَ اللَّيْلِ" رواه مسلم .