Reciting 1000 Ikhlas on the Day of Arafa

What is the importance of reciting 1000 surah ikhlas on the Day of Arafa?

“Sins of that who recites one thousand ikhlas with basmala are forgiven and his dua (pray) is accepted.” (Abu Shaykh)
In a hadith it is narrated that:
“Whoever recites surat-u Ikhlas one thousand times between the afternoon and evening on the day of Arafa, Allah (swt) bestowes him whatever he wishes.”
Another hadith about surah Ikhlas is “Reciting surah ikhlas is a means of forgiveness for the sins except the sins about human rights.” (Abu Shaykh)