‘Umar reported the Prophet as saying, “He who brings goods for sale is blessed with good fortune, but he who keeps them till the price rises is accursed.”
Anas said that when prices were high in the Prophet’s time the people asked him to fix prices for them, but he replied, “God is the One who fixes prices, who withholds, gives lavishly and provides, and I hope that when I meet my Lord none of you will have any claim on me for an injustice regarding blood or property.”
Tirmidhi, Abu Dawud, Ibn Majah and Darimi transmitted it.
Abu Sa'id al-Khudri reported God’s Messenger as saying, “If anyone pays in advance for an article he may not transfer, it to someone else before he receives it.”