Surah 49:14:
The Bedouins say, 'We have believed.' Say, 'You have not believed; but say, "We have submitted," for faith has not yet entered your hearts. And if you obey Allah and His Messenger, He will not deprive you from your deeds of anything. Indeed, Allah is Forgiving and Merciful.
Verse 14 provides one of the most candid windows in the entire Quran into the actual, non-spiritual nature of the early Islamic expansions.
The Geopolitical Capitulation: As Muhammad's military power grew, various Bedouin tribes realized that resisting Medina meant economic ruin, asset plundering, or military destruction. They flooded into Medina declaring, "We have believed (āmannā)."
The Textual Correction: The Quran sharply rebukes them, ordering them to say instead: "We have submitted (aslamnā), for faith has not yet entered your hearts."
The Critical Verdict: Textual critics note that this verse completely dismantles the romanticized historical narrative that Islam spread organically through the irresistible spiritual beauty of its message. The text openly acknowledges a clear, structural divide between political/military capitulation (Islam) and actual theological conviction (Iman). The Bedouins were converting as a matter of geopolitical vassalage to avoid the wrath of Muhammad's army and to secure a share of the state's expanding war booty, proving that "submission" was frequently a transactional treaty signed at the tip of a sword.