Sayyiduna Ma'qil bin Yasar (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever interferes in anything of the prices of the Muslims, intending to make it expensive for them, it is a right upon Allah that He throw him into the greatest part of Hell."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17614