It is narrated from Qatadah (may Allah have mercy on him) concerning the saying of Allah Almighty, "O you who believe, do not consume one another's wealth unjustly among yourselves, except by trading with one another by mutual consent" [Surah al-Nisa: 29], that he said: What is meant by it is trade; it is provision from Allah and among the things Allah has made lawful, for the one who seeks it with truthfulness and righteousness.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10396