Allah subhanahu wa’ta’ala has clearly told us that they are the best days of the year. Allah has sworn by the nights of these 10 days to show you the greatness of the days.
The day of arafah Allah rabbuna jalla jalaluhu descends to the last heavens and comes close to us and then he boasts about the people of arafah to to the people that are with Allah subhanahu wa’ta’ala.
It was for all of the people on the day of arafah that they would get their duas answered by Allah subhanahu wa’ta’ala. Subhanallah walhamdulillah wala ilaha illallah wallahu akbar these Small deeds are more beloved to Allah subhanahu wa’ta’ala in any other Deeds at all.
Make a Muslim happy and Allah will make you happy on the day that you meet him, in one authentic Hadith