Dua in Sujood

Is it essential that the du'aa's recited in prayer beproven in the Sunnah?
When praying, if the worshipper bows and prostrates for a long time,
does he have to recite all the adhkaar that are narrated from the
Prophet(peace and blessings of Allaah be upon him) or canhe say
whatever du'aa' he likes?.
Praise be to Allaah.
There is nothing wrong with a worshipper saying whatever du'aa' he
wants in his prayer, those that are narrated in the Sunnah– which are
the best and most comprehensive of du'aa's – or any kind of
permissible du'aa' that he wishes.
The one who recites du'aas that are narrated insharee'ah will be
rewarded for following what is narrated in sharee'ah, and he will be
rewarded for his du'aa'.
Among the texts which show that du'aa' in general is permissible is
the words of the Prophet (peace and blessings of Allaah be upon him):
"Then let him choose whatever supplications he wishes." According to
another report: "Then let him choose whatever du'aa' he likes and say
it." Narrated by al-Bukhaari (835) and Muslim (402). This was narrated
concerning du'aa'before the salaam at the end of the prayer.
Shaykh 'Abd al-'Azeez ibn Baaz (may Allaah have mercy on him) said:
It is prescribed for the believer to say du'aa' during his prayer in
the places when du'aa' is allowed, whether the prayer is obligatory or
supererogatory (naafil). The places where du'aa' is allowed are
prostration, between the two prostrations and at the end of the prayer
after thetashahhud and blessings upon the Prophet (peace and blessings
of Allaah be upon him) and before the tasleem, as it is proven that
the Prophet (peace and blessings of Allaah be upon him) used to pray
forforgiveness between the two prostrations and it is proven that he
used to saybetween the two prostrations: "Allaahumma ighfir li
wa'rhamni wa'hdini wa'jburni wa'rzuqni wa 'aafini."
(O Allaah, forgive me, havemercy on me, guide me, enrich me, grant me
provision and keep me safe and sound).
And he (peace and blessings of Allaah be upon him) said: "As for
bowing, glorify the Lord therein, and as for prostrating, strive hard
in du'aa' therein because it is more likely that you will receive a
response." Narrated by Muslim in his Saheeh. Muslim also narrated from
Abu Hurayrah (may Allaah be pleased with him) that the Prophet (peace
and blessings of Allaah be upon him) said:
"The closest that a person is to his Lord is when he is prostrating,
so say a lot of du'aa' then."
In al-Saheehayn it is narrated from 'Abd-Allaah ibn Mas'ood (may
Allaah be pleased with him) that when the Prophet (peace and blessings
of Allaah be upon him) taught him the tashahhud he said: "Then let him
choose whateversupplications he wishes." According to another report:
"Then let him choose whatever du'aa' he likes and say it."
There are many ahaadeeththat speak of this, and they indicate that it
is prescribed to say du'aa' in these places in the prayer, whether it
has to do with the Hereafter or with worldly matters, so long as the
du'aa' does not involve any sin or severingof family ties. And it is
better to say a lot of du'aa's that were narratedfrom the Prophet
(peace and blessings of Allaah be upon him). End quote.
Fataawa al-Shaykh Ibn Baaz (11/171, 172).
He (may Allaah have mercy on him) also said:
There is nothing wrong with saying du'aa' during prayer, whether that
is for oneself or for one's parents or anyone else. Rather that is
prescribed, because the Prophet (peace and blessings of Allaah be upon
him) said: "The closest that a person is to his Lord is when he is
prostrating, so say a lot of du'aa' then." … Then he quoted the
ahaadeeth that we have mentioned above, then he said:
So if he says du'aa' when he is prostrating or at the end of the
prayer, for himself or for his parents or for the Muslims, there
isnothing wrong with that, because of the general meaning of these
ahaadeeth and others. Endquote.
Fataawa al-Shaykh Ibn Baaz (11/173, 174).
And Allaah knows best.

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