Some people strongly object to reciting Zikr in a loud voice after Salaah and say that this act is a Bid'ah (innovation) in Islam. The followers of the Ahle Sunnah Wal Jama'at recite Zikr in a loud voice after Salaah since the Holy Prophet Muhammad (sallal laahu alaihi wasallam) used to recite Zikr aloud after Salaah.

Sayyiduna Abdullah ibn Abbas (radi Allahu anhuma) reports: "The recitation of Zikr aloud after the Fardh Salaah is since the time of the Holy Prophet (sallal laahu alaihi wasallam)." (Bukhari Shareef; Muslim Shareef) This Hadith Shareef proves that it is permissible to recite Zikr aloud after Salaah. (Fathul Baari)

Sayyiduna Abdullah bin Abbas (radi Allahu anhu) states that when the Sahaba-i-Kiraam would complete their Salaah, he used to hear pure Zikr with his ears (i.e. loud Zikr). (Bukhari Shareef; Muslim Shareef)

Sayyiduna Ibn Abbas (radi Allahu anhu) says, "I used to know the end of the Salaah of Nabi Kareem (sallal laahu alaihi wasallam) by the sound of the Takbeer." (Mishkaat Shareef; Sahih Muslim Shareef) From this Hadith Shareef we learn how loud the Zikr after the Salaah should be. The fact that ibn Abbas (radi Allahu anhu) realised the end of Salaah through the Zikr shows that Zikr was recited aloud after Salaah. The Takbeer referred to here is the Zikr that is recited aloud. (Ash'atul Lam'aat)

Another authentic Kitaab confirms that the Holy Prophet (sallal laahu alaihi wasallam) used to perform Zikr aloud. (Ash'atul Lam'aat)

Allama Ibn Abideen Shaami (alaihir rahmah) states that the past and the present Ulema have said that to read Zikr aloud (Bil Jahr) in a congregation is Mustahab (desirable), whether the Zikr is in the Musjid or anywhere else. (Shaami Shareef; Tahtaawi Shareef)

The Sufis, according to their ritual, used to recite Zikr aloud after Salaah, for which original source is present. (Fatawa Hadithia) None of the Sahaba of the Holy Prophet (sallal laahu alaihi wasallam) ever objected to the practice of Zikr Bil Jahr (loud Zikr).

Allama Sayed Ahmed Tahtaawi (alaihir rahmah) giving reference to "Fatawa Bizaazia" says that any person who stops Zikr Bil Jahr in the Musjid is said to be a Zaalim (Tyrant).