﴿ يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ لَا تَأْكُلُوا۟ ٱلرِّبَوٰٓا۟ أَضْعَٰفًۭا مُّضَٰعَفَةًۭ ۖ وَٱتَّقُوا۟ ٱللَّهَ لَعَلَّكُمْ تُفْلِحُونَ ﴾

“O YOU who have attained to faith! Do not gorge yourselves on usury, doubling and re-doubling it - but remain conscious of God, so that you might attain to a happy state;”

(O ye who believe!) i.e. Thaqif. (Devour not usury, doubling) the silver coin (and quadrupling) the appointed period for repayment. (Observe your duty to Allah) fear Allah regarding the consumption of usury, (that ye may be successful) so that you be saved from Allah's wrath and punishment.