Facebook “Your account is temporarily locked” message help request

According to this Facebook topic it seems like there's no way of retrieving the message that was attached to the friend request.

As a last resort, if you have the original notification email still in your inbox, the message might be there?

You cannot stop locking account permanently, because whenever something smell suspicious to Facebook, they immediately locked the account and ask user to verify the identity for security purpose. Sometimes Facebook also locked an account when one or more friends report about the account.

Here are some tips to keep an account secure and avoid locking:

• Keeping Your Account Secure
  • add a phone number and verify it
  • verify you email address
  • turn on notification about your account, security and privacy
  • set the get alerts about unrecognized logins
  • choose 3 to 5 friends to contact if you get locked out
• Complete you profile with all valid data
• Avoid Spam and Scams

If still you face the issue then report a problem to Facebook.