Riyad as-Saliheen 1721
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].
عن أبي قتادة رضي الله عنه أنه سمع رسول الله ﷺ يقول:
"إياكم وكثرة الحلف في البيع، فإنه ينفق ثم يمحق" ((رواه مسلم)).
Classification
Sahih (Authentic)
References
Riyad as-Saliheen 1721
Riyad as-Saliheen Book of Prohibited actions, Hadith 211