Musannaf Ibn Abi Shaybah 14461 — Takbir during the days of Tashriq

Mujahid heard a man saying the takbir during the ten days and said: Why did he not raise his voice? I have certainly seen those people when one of them would say the takbir in the mosque and the whole mosque would reverberate with it. Then the sound would go out to the people of the valley until it reached al-Abtah, and al-Abtah would reverberate with it, and the source of it all was that one man.