Barclays analyst sends 'commandments' email to interns

Email Simon Stratford

Dishing out blunt "commandments" to the bank's new summer interns.

A new group of summer interns is getting started at Wall Street firms, seeking guidance from older employees who know the ropes. One Barclays employee took it upon himself to dish out blunt advice to the bank's new go-getters.

An email from Justin Kwan, who works as an analyst at the firm, is making the rounds around Wall Street. The email obtained by CNBC - titled "Welcome to the Jungle"- runs through Kwan's "10 Power Commandments" for the bank's Global Power and Utilities interns.

Kwan writes the interns are expected to leave the office last every night and never take off their jackets at work. Kwan recommends bringing a pillow, as it eases the "very likely scenario" of sleeping under a desk.

Keeping an extra tie or scarf could come in handy, as associates may run out of napkins, Kwan said.

Read More These interns will make more $ than you this summer

He added that an intern working during his time in the group requested a weekend off for a family gathering, only to be asked to hand in his phone and pack up his desk.

In a statement, Barclays said it did not authorize the email. The firm added that it was "committed to creating an environment where both our bankers and our business can thrive."

"We have implemented policies and training guidelines to enable employees to gain valuable experience while at the same time maintaining a healthy work-life balance," Barclays added.

Read More 10 tips for your summer internship

The bank declined to say whether Kwan was still employed.

Kwan did not immediately respond to CNBC's request to comment.

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