Hadith #3326 (Sunan Abi Dawud)
Book: Commercial Transactions (Kitab Al-Buyu)
Narrator(s): Abdul Malik bin A'yn عبد الملك بن أعين الكوفي مولى بني, al-Husain bin 'Isa bin Hamran الحسين بن عيسى بن حمران, Asim al-Ahwal عاصم الأحول, Jami' bin Abi Rashid جامع بن أبي راشد الكاهلي, Qays bin Abi Hazim قيس بن أبي حازم, Shaqayq bin Salmah al-Asadi شقيق بن سلمة الأسدي أبو وائل الكوفي, Sufyan bin 'Uyaynah سفيان بن عيينة
Grade: Sahih

In the time of the Messenger of Allah (ﷺ) we used to be called brokers, but the Prophet (ﷺ) came upon us one day, and called us by a better name than that, saying: O company of merchants, unprofitable speech and swearing takes place in business dealings, so mix it with sadaqah (alms).

Source: https://parallelquran.com/hadith/sunan-abi-dawud-3326/