Abu Qatadah (May Allah be pleased with him) said:
I heard the Messenger of Allah (ﷺ) saying, "Beware of excessive swearing in sale, because it may promote trade but this practice will eliminate the blessing."[Muslim]. (DE)
App reference (DE): Book 18, Hadith 211 (DE)
Arabic/English book reference (DE): Book 18, Hadith 1721 (DE)