Adhkar Recited After Prayer

The Sunnah (Prophetic guidance) is for the Muslim to say after every
obligatory prayer, whether he prayed as an imam (leader) or behind an imam
or on his own: Astaghfirullah (I ask Allah for forgiveness) three
times, then Allahumma anta al-salam wa minka al-salam tabarakta ya dhal-jalali
wa’l-ikram (O Allah, You are the One Who is free from all defects and
deficiencies and from You is all peace, blessed are You, O Possessor of
majesty and honour). Then he should turn to face the people if he was the
imam, then he and the other worshippers, and similarly the one who prayed on
his own should say: La ilaha ill-Allah wahdahu la shareeka lah,
lahu’l-mulk wa lahu’l-hamd wa huwa ‘ala kulli shay’in qadeer. La hawla wa la
quwwata illa Billah wa la na’budu illa iyyah. Lahu’l-ni’mah wa lahu’l-fadl
wa lahu’l-thana al-hasan. La ilaha ill-Allah mukhliseena lahu’l-deena wa law
kariha’l-kafiroon. Allahumma la mani’a lima a’tayta wa la mu’tiya lima
mana’ta wa la yanfa’u dha’l-jaddi minka al-jadd  (There is no god but
Allah Alone, with no partner or associate His is the sovereignty and to Him
be praise, and He is Able to do all things. There is no power and no
strength except with Allah, and we worship none but Him.  From Him (alone)
come all blessings and favours, and all good praise is due to Him. There is
no god but Allah and we make our worship purely for Him (alone) however much
the disbelievers may hate that. O Allah, none can withhold what You give and
none can give what You withhold, and no wealth or majesty can benefit anyone
for from You is all wealth and majesty).

After the Maghrib (sunset) and Fajr (dawn) prayers he should say, as well as
the words mentioned above: La ilaha ill-Allah wahdahu la shareeka lah,
lahu’l-mulk wa lahu’l-hamd yuhyi wa yumeet wa huwa ‘ala kulli shay’in qadeer
(there is no God but Allah alone, with no partner or associate, His is the
Dominion and to Him be praise, He gives life and gives death, and He has
power over all things) ten times. Then after that he should say Subhan Allah
wa’l-hamdu Lillah wa Allahu akbar (Glory be to Allah, praise be to Allah and
Allah is most great) 33 times, and to complete one hundred he should say:
La ilaha ill-Allah wahdahu la shareeka lah, lahu’l-mulk wa lahu’l-hamd wa
huwa ‘ala kulli shayin qadeer (There is no god but Allah Alone, with no
partner or associate His is the sovereignty and to Him be praise, and He is
Able to do all things). 

The Sunnah is for the imam, the person who prays on his own and the person
who prays behind an imam to recite these adhkar out loud after every
obligatory prayer in a moderate voice that is not too loud, in an ordinary
tone. It is proven in al-Saheehayn from Ibn ‘Abbas (may Allah be
pleased with him) that raising the voice in dhikr when the people have
finished the obligatory prayer was what was done at the time of the Prophet
(peace and blessings of Allah be upon him). Ibn ‘Abbas (may Allah be pleased
with him) said: I would know that they had finished when I heard that. 

It is not permissible to recite out loud in unison; rather each person
should recite to himself without paying attention to the voice of anyone
else, because reciting dhikr in unison is an innovation for which there is
no basis in Islam. 

Then it is prescribed for the imam, the people praying behind an imam and
the one who is praying alone to recite Ayat al-Kursiy silently, then for
each of them to recite Qul Huwa Allahu Ahad, Qul a’oodhu bi Rabbi’l-Falaq
and Qul a’oodhu bi Rabbi’l-Nas [i.e., the last three surahs of the Quran]
silently. After Maghrib and Fajr one should repeat Qul Huwa Allahu Ahad, Qul
a’oodhu bi Rabbi’l-Falaq and Qul a’oodhu bi Rabbi’l-Nas three times. This is
the best because of the soundness of the reports that indicate all that we
have stated above. 

May Allah send peace and blessings upon our Prophet Muhammad and his family
and Companions and those who followed them in truth until the Day of
Judgement. End quote. 

And Allah knows best.