First ten days of Dhul Hijjah; Days of virtue and righteous deeds

 بسم الله الرحمن الرحيم

Ibn ‘Abbas says about the Aayah, “Remember ALLAH during the well known days,” that it refers to the first ten days of Dhul-Hijjah. [This is related by al-Bukhari]
“There is no day upon which Allah frees His servants from the Hellfire more than the day of Arafat.”

[Sahih Muslim 1348]

مَا مِنْ يَوْمٍ أَكْثَرَ مِنْ أَنْ يُعْتِقَ اللَّهُ فِيهِ عَبْدًا مِنْ النَّارِ مِنْ يَوْمِ عَرَفَةَ