Du`a' when reciting an Ayah speaking of mercy or punishment

Q 3: I heard some Imams saying some quiet comments after reciting some Ayahs (Qur'anic verses) speaking of torture or glad tidings after Al-Fatihah, for example, after the last Ayah (Qur'anic) of Surah Al-Qiyamah: Is not He (Allâh Who does that) Able to give life to the dead? (Yes! He is Able to do all things). We hear the Imam saying: “Glory be to You! Yes indeed!” Another example from Surah ‘Amma: Truly, Hell is a place of ambush - , after which the Iman may say: “O Allah, protect us from it.” What is the ruling on such words which are not part of the Ayahs whether the Imam recites them in an audible or inaudible voice? A: If the Imam asks Allah, seeks refuge, and glorifies Him at every suitable Ayah during voluntary Salah, it is authentically reported from the Prophet (peace be upon him) that this is Mustahab (desirable), as in the Hadith of Hudhayfah in (Sahih Muslim) when he described the Prophet’s Salah (Prayer) and his recitation at night, saying: “When he (peace be upon him) recited an Ayah which mentioned Tasbih (glorification of Allah), he would glorify Allah; when he recited an Ayah which mentioned begging, he would beg from Him; when he recited an Ayah which mentioned seeking refuge with Allah, he would seek refuge with Him.” If a person does this in the obligatory Salah, it is better for him not to do it because it was not reported that the Prophet (peace be upon him) did that during the obligatory Salah. (Part No. 5; Page No. 345

A: If the Imam asks Allah, seeks refuge, and glorifies Him at every suitable Ayah during voluntary Salah, it is authentically reported from the Prophet (peace be upon him) that this is Mustahab (desirable), as in the Hadith of Hudhayfah in (Sahih Muslim) when he described the Prophet’s Salah (Prayer) and his recitation at night, saying: “When he (peace be upon him) recited an Ayah which mentioned Tasbih (glorification of Allah), he would glorify Allah; when he recited an Ayah which mentioned begging, he would beg from Him; when he recited an Ayah which mentioned seeking refuge with Allah, he would seek refuge with Him.” If a person does this in the obligatory Salah, it is better for him not to do it because it was not reported that the Prophet (peace be upon him) did that during the obligatory Salah. (Part No. 5; Page No. 345) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.