Washing the hands three times at the beginning
This is based on the hadith of Aus ibn Aus al-Thaqafi who said, "I saw the Messenager of Allah make ablution, and he washed his hands three times." (Related by Ahmad and an-Nasa'i.) Abu Hurairah reported that the Prophet, upon whom be peace, said, "When one of you rises from his sleep, he should not put his hand into a pot until he has washed it three times, for he does not know where his hand was (while he slept)." (Related by "the group", al-Bukhari did not mention the number of times.)
Rinsing the mouth three times
     Laqit ibn Sabrah reported that the Prophet said, "When    one performs ablution, he should rinse his mouth."
    (Related by Abu Dawud and al-Baihaqi.)    
Sniffing up and blowing out water three times
     Abu Hurairah reported that the Prophet, upon whom be    peace, said, "When one of you performs ablution, he    should sniff water up his nostrils and then blow it out."
    (Related by al-Bukhari, Muslim and Abu Dawud.)         The sunnah is to put the water into the nostrils with the    right hand and blow it out with the left. 'Ali once    called for water for ablution, rinsed his mouth, sniffed    up water into his nostrils and blew it out with his left    hand. He did that three times and then said, "That is how    the Prpohet, upon whom be peace, would purify himself."
    (Related by Ahmad and an-Nasa'i.)         This sunnah is fulfilled by putting water into the mouth    and nostrils in any way. The practice of the Prophet was    to do both acts at the same time. 'Abdullah ibn Zaid    said, "The Prophet would rinse his mouth and nose with    just one hand (at one time, together). He did that three    times." In one narration it says, "He would rinse his    mouth and nose with three scoops of water." (Related by    al-Bukhari and Muslim.) It is also sunnah to be plentiful    (with water) while performing this sunnah, except if one    is fasting. Laqit asked the Prophet, "Inform me about    your ablution." He replied, "Complete and perfect the    ablution and (put water) between your fingers. Use lots    of water while sniffing it up your nostrils, unless you    are fasting." (Related by "the five." At-Tirmidhi said it    is sahih.)    
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"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
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