You cannot serve two lords is Sinai’s first word aimed at a purse.
The prophets already sued Israel for trusting storehouses and alliances. Jesus aims that suit at hearts in His generation.
Matthew 6 sits inside a sermon that ends with a house in a storm. Treasure location is foundation location.
The old house stored holiness in stone and coin. That house fell. The New Creation stores treasure where the King is.
One Master. The New Creation is not a two-employer arrangement.