What is the interpretation of the saying: "There is no Riba except in An-Nasi'ah," mentioned in Sahih Al-Bukhari, and can it be used to justify the permissibility of bank interest?

The Hadith "There is no usury except in nasi'a" does not negate the existence of usury except in it. Rather, it negates the complete or primary intended usury from it, and indicates that the true usury for which the Quran was revealed is often riba al-nasi'a. Both riba al-nasi'a and riba al-fadl are forbidden, but riba al-nasi'a is more severely prohibited because it is from the prohibition of ultimate intentions, whereas riba al-fadl was prohibited because it is a means to riba al-nasi'a. A loan with interest is forbidden by scholarly consensus and falls under riba al-nasi'a.