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Imam Sadiq (a.s.) said regarding the verse: and to Him submits whoever is in the heavens and the earth, willingly or unwillingly (Surah Raad (13): Verse 15)
When Qaim (a.t.f.s.) reappears, no part of the earth shall remain but upon it will be announced the testimony: There is no god except Allah. And Muhammad is the Messenger of Allah.
Al-Burhaan fi Tafseer al-Quran