Narrated ‘abdu ALlaah ibn ‘Umar (رَضِيَ الله عَنْهُمَا) that the messenger of Allaah (صَلَّى للَّهُ عَلَيْهِ وَسَلَّمَ) said:
“He who prays ad-Doha, fasts three days every month and does not abandon Witr neither travelling nor at residence, will have the reward of a martyr written for him”
[atTabarani in Muyamma’ azZawa’ed (241/2), declared saheeh by sheikh al-Albani (rahimahu Allaah) in sahih at-Targhib wa Taarhib, no. 595]
Note: ad-Doha starts when the sun raises the length of a spear (approximately 10 to 20 minutes after sunrise) and ends about 15 to 30 minutes before the adhan for duhr, it is prayed in pairs of rakats and can consist of at least two, to as many rakat as you would like beyond that. To read this information (regarding ad-Doha) directly from sheikh Bin Baz rahimahu Allaah please visit: http://www.binbaz.org.sa/mat/15443
Source: Benefit shared by brother AbduLlah alMeksiki via Yahoo groups
Abu Hurairah (May Allah be pleased with him) reported:
My friend (the Messenger of Allah) (sallallaahu ’alayhi wa sallam) directed me to observe fast for three days in every month, to perform two Rak`ah (optional) Duha prayer at forenoon and to perform the Witr prayer before going to bed.
[Al-Bukhari and Muslim].
Abu Dharr (May Allah be pleased with him)reported: The Prophet (sallallaahu ’alayhi wa sallam) said, “In the morning, charity is due on every joint bone of the body of everyone of you. Every utterance of Allah’s Glorification (i.e., saying Subhan Allah) is an act of charity, and every utterance of His Praise (i.e., saying Al-hamdu lillah) is an act of charity and every utterance of declaration of His Greatness (i.e., saying La ilaha illAllah) is an act of charity; and enjoining M`aruf (good) is an act of charity, and forbidding Munkar (evil) is an act of charity, and two Rak`ah Duha prayers which one performs in the forenoon is equal to all this (in reward).” [Muslim].
Commentary: “Charity is due from every joint bone” means that when a person gets up in the morning, it is obligatory for him to thank Allah for having every joint of his intact. Therefore, one must praise and glorify Allah. Since a single invocation of the words mentioned in this Hadith is equivalent to one Sadaqah, one must say these words for 360 times – a number which equals the number of joints in man’s body. Moreover, to enjoin someone to do what is good and dissuade somebody from vice constitutes Sadaqah. However, if one performs two Rak`ah of Duha prayer, it will serve for Sadaqah for all the joints of the body. Thus, this Hadith highlights the merits and importance of Duha prayer. We also learn from this Hadith that Sadaqah is not restricted to spending money alone but also has a vast meaning and covers all forms of virtues mentioned here.
Source of the above : Merit of the (Optional) Duha (Forenoon) Prayer – Riyadh ul Saleheen