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https://abdurrahman.org/2017/10/15/the-wisdom-behind-saying-la-hawla-wa-la-quwwata-illa-billah-when-the-muadhin-says-hayya-ala-al-salah-and-hayya-ala-al-falah/
The wisdom behind saying, "Laa Hawla Wa-Laa Quwwata illa Billah" when the Mu'adhin says, "Hayya `Ala Al-Salah" and "Hayya `Ala Al-Falah" - Imam Ibn Baz