What is the meaning of Mark 11:17?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

Then Jesus began to teach them, and He declared, “Is it not written: ‘My house will be called a house of prayer for all the nations’? But you have made it ‘a den of robbers.’”

Berean Standard Bible (BSB)

He taught, saying to them, “Isn’t it written, ‘My house will be called a house of prayer for all the nations?’ But you have made it a den of robbers!”

World English Bible (WEB)

And{G2532} he taught{G1321}{(G5707)}, saying{G3004}{(G5723)} unto them{G846}, Is it{G1125} not{G3756} written{G1125}{(G5769)},{G3754} My{G3450} house{G3624} shall be called{G2564}{(G5701)} of all{G3956} nations{G1484} the house{G3624} of prayer{G4335}? but{G1161} ye{G5210} have made{G4160}{(G5656)} it{G846} a den{G4693} of thieves{G3027}.

Strong's King James

(17) He instructed them saying, "Isn't it written that;'My House is to be called a house of prayer for all the nations' But you make it a bandits hideout."

The F.O.G*

[17] His teaching rang out with passionate clarity: "Doesn't Scripture declare, 'My house will be called a house of prayer for all nations'? But you've twisted it into a den of thieves!" His words cut through centuries of religious corruption.

The F.O.G Paraphrase

and he was teaching, saying to them, ‘Hath it not been written—My house a house of prayer shall be called for all the nations, and ye did make it a den of robbers?’

Young's Literal Translation