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Supplications during the prostration
Whoever makes this prostration may supplicate whatever he wishes. There is nothing authentic from the Prophet sallallahu alehi wasallam on this point except for the hadith from 'Aishah who said: "When the Prophet made the sajdah of the Qur'anic recital, he would say: 'I have prostrated my face to the One Who created it and brought forth its hearing and seeing by His might and power.
Blessed be Allah, the best of Creators.'" This is related by the five, except Ibn Majah, and al-Hakim. At-Tirmidhi and Ibn as-Sakan grade it sahih. The later however adds that at the end the Prophet would say, three times, what he always said in his sujjud: "Glory be to my Lord, the Most High," that is, if he was making the sujjud of recital during a prayer.
Prostration of recital during the prayer
It is allowed for the imam or the one praying individually to recite "'ayyah of sajdah" during the salah, even if the recital is audible (jahriyyah) or inaudible (siriyyah), and he should prostrate, during the salah, after reading such 'ayat. Al-Bukhari and Muslim record from Abu Raf'i who said: "I prayed salatul 'isha with Abu Hurairah and he recited Idhas-sama'u un-shaqqat [al-Inshiqaq] and he prostrated during the prayer. I asked: 'O Abu Hurairah, what prostration is this?' he said: 'I made a prostration when reciting (this surah) behind Abu al-Qasim (Prophet), and since then I never stopped making a sajdah whenever I recite it."' Al-Hakim relates, from Ibn 'Umar, with a sound chain that meets the criteria of al-Bukhari and Muslim, saying that the Prophet sallallahu alehi wassalam made a sajdah during the first rak'ah of the noon prayer and his companions were of the opinion that he had recited surah as-Sajdah.
An-Nawawi says: "It is not disliked for the imam to recite 'ayat of sajdah, according to our school, or for the one who prays individually. And it does not matter if the recital is audible or inaudible. And he should make sajdah after he recites them."
Malik holds: "In general it is disliked." Abu Hanifah's opinion is that: "It is disliked during the silent recitals but not during the audible recitals." The author of al-Bahr maintains: "According to our school, it is preferred to delay the sajdah until after he [the imam] makes the taslim in order not to confuse the people praying behind him."
"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