Ibn Abbas regarded this narration as evidence that usury is limited to deferred payment and does not apply to immediate exchanges. This also indicates that the word "Innama" (Indeed only) conveys restriction and exclusivity in its meaning. This is further evidenced by the dispute among the companions regarding the meeting of the two circumcised parts (sexual intercourse). Those who argued that it does not necessitate a full ritual bath (Ghusl) used this term as their proof.
Commentary #34