The ten days of Dul Hijjah

 The best days of the world Hadith

عَنِ ابْنِ عَبَّاسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَا مِنْ أَيَّامٍ الْعَمَلُ الصَّالِحُ فِيهِنَّ أَحَبُّ إِلَى اللَّهِ مِنْ هَذِهِ الْأَيَّامِ الْعَشَرَةِ...   رَوَاهُ البُخَارِيّ

  صَحِيحٌ (الألباني)

Ibn ‘Abbas reported Allah's Messenger as saying, “There are no days in which a good deed is more pleasing to Allah than these ten days.” On being asked whether not even jihad in Allah’s path were as pleasing, he replied, “Not even jihad in Allah’s path, except when a man goes out in person with his property and loses both life and property.”

Bukhari transmitted it.

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Sheikh Ibn Uthaymeen, may Allah have mercy on him, said, it is the ten days of Dhul-Hijjah