Salim bin 'Abdullah bin 'Umar سالم بن عبد الله بن عمر بن الخطاب · Commercial Transactions (Kitab Al-Buyu)

The Messenger of Allah (ﷺ) sent with him a dinar to buy a sacrificial animal for him. He bought a sheep for a dinar, sold it for two and then returned and bought a sacrificial animal for a dinar for him and brought the (extra) dinar to the Prophet (ﷺ). The Prophet (ﷺ) gave it as alms (sadaqah) and invoked blessing on him in his trading.

The Messenger of Allah (ﷺ) forbade the leasing of land. I asked: (Did he forbid) for gold and silver (i.e. dinars and dirhams)? He replied: If it is against gold and silver, then there is no harm in it.