Verses with the word den in the New Testament (3 verses):

Matthew 21:13
And said unto them, It is written, My house shall be called the house of prayer; but ye have made it a den of thieves.

Mark 11:17
And he taught, saying unto them, Is it not written, My house shall be called of all nations the house of prayer? but ye have made it a den of thieves.

Luke 19:46
Saying unto them, It is written, My house is the house of prayer: but ye have made it a den of thieves.