According to search-discovered classical Islamic scholarship, the principle of prioritizing faith over material gain is powerfully established in Quran 4:94. Tafsir literature, such as that of Ibn Kathir and Al-Qurtubi, explains this verse was revealed to correct companions who, on a military expedition, killed a man who offered the Islamic greeting, suspecting it was a ruse to protect his property. The verse explicitly forbids this, stating not to reject a person's claim to faith in pursuit of `arad al-hayat ad-dunya`—'the fleeting goods of this worldly life'. This historical context grounds a universal Islamic ethic: one must not allow the desire for worldly possessions to corrupt one's judgment or lead to injustice and the violation of life. The verse powerfully contrasts temporary spoils with the 'abundant acquisitions' found with Allah, thereby redirecting the believer's motivation toward sincere, God-centric actions and eternal rewards. This principle extends beyond conflict to all aspects of life, forming a cornerstone of Ikhlas (sincerity).