Praise be to Allaah.
Firstly:
The Messenger (peace and blessings of Allaah be upon
him) forbade reciting Qur’aan when bowing and prostrating.
Muslim (479) narrated that Ibn ‘Abbaas (may Allaah be pleased
with him) said: The Messenger of Allaah (peace and blessings of Allaah
be upon him) said: “I have been forbidden to recite the Qur’aan when bowing
or prostrating. As for bowing, glorify your Lord therein, and as for
prostrating, strive in du’aa’, for it is deserving of a response (from your
Lord).”
Muslim (480) narrated that ‘Ali ibn Abi Taalib (may Allaah be
pleased with him) said: The Messenger of Allaah (peace and blessings of
Allaah be upon him) forbade me to recite Qur’aan when bowing and
prostrating.
The scholars are agreed that it is makrooh to recite Qur’aan
when bowing or prostrating.
See al-Majmoo’, 3/411; al-Mughni, 2/181
The wisdom behind that is:
It was said that the best pillar of prayer is standing and
the best of dhikr is reciting Qur’aan, so the best has been put with the
best, and it is not allowed to put it with anything else, lest anyone think
that it is equal to other kinds of dhikr. ‘Awn al-Ma’bood.
It was said that it is because the Qur’aan is the noblest of
speech, because it is the Word of Allaah, and the position of bowing and
prostration is one of humility and submission on the part of the worshipper,
so it is more appropriate not to recite the Word of Allaah in these two
positions. Majmoo’ al-Fataawa, 5/338
Secondly:
If a person recites a du’aa’ that is mentioned in the Qur’aan
when prostrating, such as the words (interpretation of the meaning): “Our
Lord! Give us in this world that which is good and in the Hereafter that
which is good, and save us from the torment of the Fire” [al-Baqarah 2:201],
there is nothing wrong with that, if the intention is to say du’aa’ and not
to recite Qur’aan, because the Prophet (peace and blessings of Allaah
be upon him) said: “Actions are but by intentions, and each person will have
but that which he intended.” Narrated by al-Bukhaari, 1; Muslim, 1907.
Al-Zarkashi said: It is
makrooh when it is intended as recitation of Qur’aan, but if it is intended
as du’aa’ and praise, then it is like someone who did Qunoot by reciting a
verse. End quote.
Doing Qunoot by reciting a verse from the Qur’aan is
permissible and is not makrooh.
Tuhfat al-Muhtaaj, 2/61
Al-Nawawi said in al-Adhkaar (p. 59)
If a person does Qunoot
by reciting a verse which includes a du’aa’, then he has done Qunoot, but it
is better to say the du’aa’ as narrated in the Sunnah. End quote.
This applies if he intends to say du’aa’ when he recites the
verse.
See al-Futoohaat al-Rabbaaniyyah Sharh al-Adhkaar
al-Nawawiyyah by Ibn ‘Allaan, 2/308
The scholars of the Standing Committee were asked: We know
that it is not permissible to recite Qur’aan when prostrating, but there are
some verses which include du’aa’s, such as the words, “Our Lord! Let not
our hearts deviate (from the truth) after You have guided us” [Aal ‘Imraan
3:8]. What is the ruling on saying such du’aa’s that are mentioned in
the Qur’aan, when prostrating?
They replied: There is
nothing wrong with that if it is done as a du’aa’ and not as recitation of
Qur’aan. End quote.
Fataawa al-Lajnah al-Daa’imah,
6/443.