What is the ruling on saying "Our Lord, to You be all praise" after the Imam, if the Imam made a mistake and said "Allah heard the one who praised Him"?

The prayer is valid behind an imam who says: "Sami'a Allahu liman hamdahu" (Allah heard him who praised Him), even though it is a linguistic error by converting "hamidahu" (him who praised Him) to a dual form or not fully pronouncing the 'h' sound. However, it does not harm the original meaning. Often, this is due to ignorance and not an intentional alteration of the prophetic wording. This does not affect the validity of the prayer, especially since the transitional takbirat (saying "Allahu Akbar") and tasmee' (saying "Sami'a Allahu liman hamidah") are from the sunan (recommended acts) and not from the wajibat (obligatory acts) according to the majority of scholars. It is recommended to alert the imam to correct his wording.