What is the ruling on a worshipper making a sound (clearing one's throat) for the bowing imam so that he does not rise, in order for the worshipper to catch the rak'ah?

If a worshiper enters the mosque and finds the Imam bowing (in ruku'), it is not from the Sunnah to alert the Imam by clearing one's throat or speaking, such as saying "Wait" or "Indeed, Allah is with the patient." This is because such actions were not practiced by the pious predecessors (Salaf as-Salih) and can cause disturbance. Instead, one should walk with tranquility and dignity until reaching the saff (row), then pronounce the takbirat al-ihram (opening takbir) and bow. The Prophet, peace and blessings be upon him, forbade hurrying when walking to prayer.