Etiquette of Supplication
     There are certain manners that must be observed while    making a supplication to Allah. These are given in the    following topics.
    
Pursuit of lawful means of Livelihood
     Ibn 'Abbas reported, "Once, when I recited the verses of    the Qur'an, 'O you people! Eat of what is on earth,    lawful and good' (2.168) in the presence of the Prophet,    peace be upon him. Sa'd b. Abi Waqqas got up and said, 'O    Messenger of Allah! Ask Allah to make me one whose    supplication is heard.' At this the Prophet, peace be    upon him, said, 'O Sa'd, consume lawful things and your    supplications will be heard, and by Him in Whose hands is    the soul of Muhammad, when a man puts into his stomach a    morsel of what is forbidden his prayers are not accepted    for forty days, and a servant of Allah whose body is    nourished by usury or by what is forbidden becomes more    deserving of the Hell fire." (Al-Hafiz b. Marduwiyah)         Abu Hurairah reported that the Prophet, peace be upon    him, said, "O people, Allah is Good and He, therefore,    accepts only that which is good. And Allah commanded the    believers as He commanded the Messengers by saying, 'O    Messengers, eat of the good things, and do good deeds;    verily I am aware of what you do,' Qur'an 23.51 and He    said: 'O those who believe, eat of the good things that    We gave you'." Qur'an 2.172 The Prophet, peace be upon    him, then made mention of a person who travels widely,    his hair dishevelled, and covered with dust. "He lifts    his hands and makes supplication, 'O Lord, O Lord,' but    his diet is unlawful, his drink is unlawful, and his    clothes are unlawful, and his nourishment is unlawful.
    How then can his supplication be accepted?" (Muslim and    Ahmad)    
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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