Is the Imam's repetition of an verse or part of an verse directly before bowing (ruku‘), with the intention of informing the people that he is about to bow, considered an innovation (bid‘ah)?

Repeating some verses after Al-Fatihah in prayer is permissible, and this includes repeating the last verses recited by the Imam. However, consistently adhering to this is not advisable and may fall under the category of an added innovation (bid'ah idafiyyah). Some scholars have recommended a brief silence after completing the recitation instead of repetition.