Musannaf Ibn Abi Shayba 35:245

Ibn ‘Uyaynah narrated to us, from Shabib ibn Gharqadah, from ‘Urwah al-Bariqi, that the Prophet (may Allah bless him and grant him peace) gave him a dinar to buy a sheep with it. He bought two sheep with it, then sold one of them for a dinar. He came to the Prophet (may Allah bless him and grant him peace) with a dinar and a sheep. The Prophet (may Allah bless him and grant him peace) prayed for him for blessing in his trade, such that if he had bought dust, he would have made a profit on it.