the Prophet said: "There are no days more beloved to Allah that He be worshipped in them than the ten days of Dhul-Hijjah, fasting every day of them is the equivalent of fasting a year, and standing every night of them (in prayer) is the equivalent of standing on the Night of Qadr."  

عَنِ النَّبِيِّ ﷺ قَالَ مَا مِنْ أَيَّامٍ أَحَبُّ إِلَى اللَّهِ أَنْ يُتَعَبَّدَ لَهُ فِيهَا مِنْ عَشْرِ ذِي الْحِجَّةِ يَعْدِلُ صِيَامُ كُلِّ يَوْمٍ مِنْهَا بِصِيَامِ سَنَةٍ وَقِيَامُ كُلِّ لَيْلَةٍ مِنْهَا بِقِيَامِ لَيْلَةِ الْقَدْرِ  

“There are no days in this world during which worship is more beloved to Allah, Glorious is He, than the (first) ten days (of Dhul- Hijjah). Fasting one of these days is equivalent to fasting for one year, and one night of them is equal to Lailatul-Qadr.”  

قَالَ رَسُولُ اللَّهِ ﷺ مَا مِنْ أَيَّامِ الدُّنْيَا أَيَّامٌ أَحَبُّ إِلَى اللَّهِ سُبْحَانَهُ أَنْ يُتَعَبَّدَ لَهُ فِيهَا مِنْ أَيَّامِ الْعَشْرِ وَإِنَّ صِيَامَ يَوْمٍ فِيهَا لَيَعْدِلُ صِيَامَ سَنَةٍ وَلَيْلَةٍ فِيهَا بِلَيْلَةِ الْقَدْرِ  

"مَا مِنْ أيَّامٍ أَحَبُّ إِلى الله أَنْ يُتَعَبَّدَ لَهُ فيها مِنْ عَشْر ذِي الحِجَّةِ، يَعْدِلُ صِيَامُ كُلِّ يَوْمٍ مِنْها بِصِيام سَنَةِ، وَقيَامُ كُلِّ لَيلَة منْهَا بقيام لَيلَة القدْرِ".