The basis for the ma'mum saying "Subhanak" when the imam praises Allah in the qunut

Question : He says: When the imam praises Allah the Exalted in his supplication during the qunut and in the recitation in the tarawih prayer, such as saying, "You decree and none can decree against You," the people behind him say "Subhanak" or "Ya Allah." Is this reported from the Salaf and does it have a basis? If it is not so, what should be said in this situation?

Answer : Yes, this has a basis. In the hadith of Hudhayfah (may Allah be pleased with him), he prayed the night prayer with the Prophet (peace and blessings be upon him), and he did not pass a verse of glorification without glorifying, nor a verse of mercy without asking for it, nor a verse of warning without seeking refuge. However, the Prophet (peace and blessings be upon him) did not perform qunut in the witr prayer. So it was not authentically reported from him that he did so, except that he taught al-Hasan ibn 'Ali to say in the qunut of witr: "O Allah, guide me among those You have guided." So if the imam praises Allah the Mighty and Majestic in the qunut of witr and the ma'mum says "Subhanak," there is no harm. Likewise, if the imam makes a supplication for safety, there is no harm, because the imam is supplicating for himself and for them.