The Ruling on Reciting the Post-Prayer Dhikr Collectively

Question:
He says: In most of our mosques, after finishing the prayer, we find all the worshippers saying in one loud voice: “We seek forgiveness from Allah, the Great, who has no god but He, the Ever-Living, the Self-Sustaining,” three times. Then they also say in a loud voice three times: “O Most Merciful of the merciful, have mercy on us.” We know that some of the ma’mum (those praying behind the imam) stand up after the imam’s taslim to complete their prayer by performing the rak’ahs they missed, and they disturb him by raising their voices. We tell them that seeking forgiveness should be done in secret, but they say: “What was reported from the Prophet (peace and blessings be upon him) was that he recited it aloud,” meaning: the recitation of the dhikr after the prayer aloud. What is your guidance? And what is the correct position? May Allah reward you with good.

Answer:
This action that you mentioned is not prescribed. Rather, seeking forgiveness is done at the time of taslim; when one says taslim from the prayer, he seeks forgiveness three times and says: “O Allah, You are Peace, and from You is peace. Blessed are You, O Owner of Majesty and Honor.” He seeks forgiveness three times with words that those around him can hear, as the Prophet (peace and blessings be upon him) used to do. Then he comes to the prescribed dhikr: “There is no god but Allah alone, with no partner. To Him belongs the dominion, and to Him belongs the praise, and He is over all things competent. There is no power and no strength except by Allah. There is no god but Allah, and we worship none but Him. To Him belongs the blessing, to Him belongs the favor, and to Him belongs the good praise. There is no god but Allah, sincere to Him in our religion, even if the disbelievers should be displeased. O Allah, there is no one who can prevent what You have given, and there is no one who can give what You have prevented, and the wealth of the wealthy does not benefit him against You.”
This is what is prescribed: raising the voice with this in a manner that does not distract the worshippers, but rather a moderate raising. This is based on the statement of Ibn Abbas (may Allah be pleased with him and his father): “Raising the voice with dhikr when the people finished the obligatory prayer in the time of the Prophet (peace and blessings be upon him) was the practice.” And Ibn Abbas said: “I knew when they had finished by that, when I heard it.” This indicates that they raised their voices, but it was a raising that did not harm the worshippers or disturb them, but rather it allowed those around the mosque and those passing by the mosque to hear it, so that they would know that the prayer had ended.
It is also recommended, along with that, to glorify, praise, and magnify Allah thirty-three times each. Every one of the worshippers says: “Subhan Allah (Glory be to Allah), Alhamdulillah (Praise be to Allah), and Allahu Akbar (Allah is the Greatest),” thirty-three times each, making a total of ninety-nine. Then he completes the hundred by saying: “There is no god but Allah alone, with no partner. To Him belongs the dominion, and to Him belongs the praise, and He is over all things competent.” This is prescribed; the Prophet (peace and blessings be upon him) recommended it and explained it to the Ummah, and he informed that it expiates sins.
It is also recommended after the obligatory prayer to recite Ayat al-Kursi: [Surat al-Baqarah: 255], whether one is the imam, the ma’mum, or praying alone, reciting it to oneself. And he recites: and the two Mu’awwidhat (the last two surahs), likewise after every prayer. And he repeats the three surahs in Maghrib and Fajr three times. He repeats the three surahs in Maghrib and Fajr three times, as the Sunnah came from the Prophet (peace and blessings be upon him). This is what is prescribed after the prayers. Yes.

The presenter: May Allah reward you with good.