money has no smell

Money has no smell - Деньги не пахнут.
Pecunia non olet (Latin for "money does not smell") is a Latin saying.

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Titus, son of the Roman emperor Vespasian, had criticized a tax on public lavatories. Vespasian held a coin from the first payment to his son's nose and asked him whether the smell was offensive. Titus said no. Vespasian replied ‘And yet it comes from urine’ (Suetonius Vespasian xxiii).
The saying has equivalents in a number of other languages.