(Al-Baqara) 2 : 278
يَا أَيُّهَا الَّذِينَ آمَنُوا اتَّقُوا اللَّهَ وَذَرُوا مَا بَقِيَ مِنَ الرِّبَا إِنْ كُنْتُمْ مُؤْمِنِينَ
Oh, you who believed! You heed Lord Allah and you give up what is remaining from usury if you are true believers.
This verse and verse 5: 57 are the only two verses beginning with “Oh you who believed” and ending with “if you are true believers”. Those who are involved in usury are not believers, and the believers should not have any relation with those who deal with usury. Heeding the Lord is only with the Adhikr. See explanation 2: 261, 268, and 4: 85.