Today is the Day of Arafat.
It is sunnah to fast for those of us not making the hajj. The Messenger of Allah صلى الله عليه وسلم said, "Fasting the day of 'Arafat expiates the sins of two years: a past one and a coming one. And, fasting the day of 'Aashura' (the tenth of the lunar month of Muharram) expiates the sins of the past year." (Reported by Muslim.)
The other sunnah is to make lots of dua. The Prophet صلى الله عليه وسلم said: "The best dua is the dua of Arafat." (Tirmidhi)
The Messenger of Allah صلى الله عليه وسلم said, "The best invocation on the day of Arafat, and the best of all the invocations I ever offered or other holy Prophets before me ever offered is: "There is no god but Allah: He is Unique ; He hath no partner, the whole universe is for Him and for Him is the praise, and He hath power over all things."
I was tagged on Facebook to contribute my favourite dua and I chose the one above. There are many duas that I love but I chose this one because it is a comprehensive dua. The 5 daily prayers are so important in Islam and it is the first thing that we will be asked about when we are in the grave. It is also what separates the believer from a non-believer. This dua asks Allah to make not only me but my children as well. It also asks Allah to forgive me, my parents and all the believers on the Day of Judgement.
Subhanallah! It is a really all-encompassing dua and it was made by Prophet Ibrahim. It is said that because of this dua that Allah gave Prophet Ibrahim a long line of progeny that were Prophets who established regular prayers. So if you want your children and your grandchildren and their children and so on, to be ones who establish regular prayer, then please learn this dua. Read it, not only on the Day of Arafat, but every day.