The Day of Arafat
Al Watr - the odd is The day of Arafat since it's on the 9th of Dhull Hijj.
Ash Shaf'i - the even, is The Day of Sacrifice and falls on the 10th of Dhull Hijj
The Fast on The Day of Arafat is equal to 1,000 Fasts (Tabarani).
The Infallibility of The Noble Messengers ﷺ
Those who annoy Allah SWT and His Messengers are cursed by Allah SWT in this world and the next, Surah 33 v57.
Be not like those who vexed Moosa (as)... Surah 33 v69.