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Invalidation of Sadaqah
It is unlawful for the one giving sadaqah to remind the recipient of his generosity, to reproach bim, or to make a show with his sadaqah. Allah warns: "O you who believe! Do not invalidate your sadaqah by reminders of your generosity or by injury, like those who spend their property to be seen by men" [al-Baqarah 264].
The Messenger of Allah, upon whom be peace, said: "There are three [types of people]. Allah shall not speak to them, notice them, or sanctify them; and for them is a grievous penalty." Abu Dhar inquired: "O Messenger of Allah, who are the ones gone wrong and astray?" He replied: "Those who through conceit lengthen their garments to make them hang on the ground, who give nothing without reproach, and who sell their merchandise swearing untruthfully [to its quality]."
Giving What is Unlawful as Sadaqah
Allah does not accept sadaqah if it is from what is unlawful: The Messenger of Allah, upon whom be peace, said: "O people! Allah is good and accepts only good, and He has instructed the believers through the Messengers.
Allah, the Mighty and the Majestic, says: 'O Messengers! Consume what is good and work righteously. I am well-acquainted with what you do' [al-Mu'minum 51]." He also calls upon [you]: 'O you who believe! Consume of the good that We have provided for you' [al-Baqarah 172].
Then [the Messenger] mentioned a man who had traveled for a long time. Unkempt and covered in dust, he raised his hands to the heavens (and cried): 'O my Lord! O my Lord!' His food was unlawful, his drink was unlawful, his clothing was unlawful, and what he had provided to sustain himself with was also unlawful. How could his invocation be accepted?" This is related by Muslim.
Also: "If one gives a date bought from honestly earned money (and Allah accepts only good), Allah accepts it in His right hand and enlarges [its rewards] for its owner (as one rears his foal) until it becomes as big as a mountain." This is related by al-Bukhari.
Allah does not accept sadaqah if it is from what is unlawful
Allah does not accept sadaqah if it is from what is unlawful: The Messenger of Allah, upon whom be peace, said: "O people! Allah is good and accepts only good, and He has instructed the believers through the Messengers.
Allah, the Mighty and the Majestic, says: 'O Messengers! Consume what is good and work righteously. I am well-acquainted with what you do' [al-Mu'minum 51]." He also calls upon [you]: 'O you who believe! Consume of the good that We have provided for you' [al-Baqarah 172].
Then [the Messenger] mentioned a man who had traveled for a long time. Unkempt and covered in dust, he raised his hands to the heavens (and cried): 'O my Lord! O my Lord!' His food was unlawful, his drink was unlawful, his clothing was unlawful, and what he had provided to sustain himself with was also unlawful. How could his invocation be accepted?" This is related by Muslim.
Also: "If one gives a date bought from honestly earned money (and Allah accepts only good), Allah accepts it in His right hand and enlarges [its rewards] for its owner (as one rears his foal) until it becomes as big as a mountain." This is related by al-Bukhari.
"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