“He tapped the wall three times with the point of his umbrella.

The brick he had touched quivered – it wriggled – in the middle, a small hole appeared – it grew wider and wider – a second later they were facing an archway large enough even for Hagrid, an archway on to a cobbled street which twisted and turned out of sight.

‘Welcome,’ said Hagrid, ‘to Diagon Alley.’

He grinned at Harry’s amazement. They stepped through the archway. Harry looked quickly over his shoulder and saw the archway shrink instantly back into solid wall.

The sun shone brightly on a stack of cauldrons outside the nearest shop. Cauldrons – All Sizes – Copper, Brass, Pewter, Silver – Self-Stirring – Collapsible said a sign hanging over them.

‘Yeah, you’ll be needin’ one,’ said Hagrid, ‘but we gotta get yer money first.’”

- Harry Potter and the Sorcerer’s Stone/Philosopher’s Stone

“Enter, stranger, but take heed Of what awaits the sin of greed, For those who take, but do not earn, Must pay most dearly in their turn, So if you seek beneath our floors A treasure that was never yours, Thief, you have been warned, beware Of finding more than treasure there.‘

Like I said, yeh’d be mad ter try an’ rob it,’ said Hagrid.”