Sayyiduna Abu Huraira (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) forbade (Bay' Gharar) deceptive sales and (Bay' Hasat) pebble sales.
Hadith Referenceالمنتقى ابن الجارود / كتاب البيوع والتجارات / 590