Two rak'at before 'Isha
     'Abdullah Ibn Mughaffal reports that the Prophet said:    "Between every adhan and iqamah there is a prayer.
    Between every adhan and iqamah there is a prayer." And,    after saying it a third time, he said: "For whoever    wishes [to pray it]." This is related by the group. Ibn    Hibban records from Ibn az-Zubair that the Prophet said:    "There exists no obligatory prayer without there being,    immediately preceding it, two rak'at."
    
Separating the Obligatory Prayer from the Supererogatory
     It is preferred to make a separation between the fard and    nawafil prayers after one finishes the fard prayer.
         One of the companions of the Prophet sallallahu alehi    wasallam reports that the Prophet prayed the afternoon    prayer and right afterward a man stood up to pray. 'Umar    saw him and told him: "Sit, the People of the Book were    destroyed because they did not differentiate between    their prayers." The Prophet said: "Well said, Ibn    al-Khattab [i.e., 'Umar]." This is related by Ahmad with    a sahih chain.
    
The witr prayer
     Its excellence and justification: The witr prayer is one    that the Prophet sallallahu alehi wasallam practiced and    which he encouraged others to practice. As such, praying    witr comes under as-sunnah al-mu'akkadah.
         'Ali says: "The witr prayer is not required like your    obligatory prayers, but the Prophet would perform the    witr prayer and say: 'O you people [followers] of the    Qur'an, perform the witr prayer, for Allah is one and He    loves the witr.'" This is related by Ahmad, an-Nasa'i,    Abu Dawud, Ibn Majah, at-Tirmidhi who calls it hasan, and    al-Hakim who grades it sahih.
         The opinion of Abu Hanifah that the witr prayer is    obligatory is a weak opinion. Ibn al-Mundhir says: "I    don't know anyone who agrees with Abu Hanifah on this    point."
         Ahmad, Abu Dawud, An-Nasa'i, and Ibn Majah record that    Al-Mukhdaji [a person of the Kinana tribe] heard from one    of the Ansar, nicknamed Abu Muhammad, that the witr    prayer is obligatory. He went to 'Ibadah ibn as-Samit and    mentioned to him what Abu Muhammad had said. 'Ibadah    observed: "Abu Muhammad is mistaken for I heard the    Messenger of Allah say: 'Five prayers are ordained by    Allah for his slaves. Whoever fulfills them properly    without any shortcoming, he will have a pact with Allah    that He will admit him into paradise. Whoever does not do    them, he will have no pact with Allah, and if He wills He    may punish him and if He wills He may forgive him.'"         Also al-Bukhari and Muslim record from Talhah ibn    'Ubaidullah that the Prophet said: "Five prayers during    the day and night have been prescribed by Allah." Hearing    this a bedouin asked the Prophet: "Is there anything else    upon me [in the way of prayer]?" The Prophet said: "No,    unless you want to do more voluntarily."
    
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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."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari