Shabib bin Gharqadah (may Allah have mercy on him) said: I heard the people of my tribe narrating from Sayyiduna Urwah bin Abi al-Ja'd al-Bariqi (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) gave him a dinar to buy a sacrificial animal for him with it. Urwah (may Allah be pleased with him) said: I bought two sheep with it, then sold one of them for a dinar and a sheep. He (peace and blessings be upon him) supplicated for blessing in my trade for me, so (through the blessing of that supplication) if he had bought even dust, he would have made a profit in it.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14484