A house of prayer, not a den of robbers
The Old Testament
“I will bring them to My holy mountain and make them joyful in My house of prayer. Their burnt offerings and sacrifices will be accepted on My altar, for My house will be called a house of prayer for all the nations.”
Isaiah 56:7
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In the New Testament
And He declared to them, “It is written: ‘My house will be called a house of prayer.’ But you are making it ‘a den of robbers.’”
Matthew 21:13
BSB
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Isaiah: my house will be called a house of prayer for all the nations. Jeremiah: has this house become a den of robbers in your eyes?
Here Jesus himself combines two words of the prophets. Mark also quotes 'for all nations'. The trading took place in the Court of the Gentiles, the only place where non-Jews could pray.