This short passage is taken from a Tablet of Baha’u’llah called the “Tablet of the World”. It was sent to two of his followers who were at that time imprisoned for their faith in Persia. It lauds their steadfastness in the face of persecution and instructs them as to how all people should behave at all times. These powerful statements remind us that the standard of God- the standard revealed by Baha’u’llah- is the complete avoidance of oppression of any form.
The Tablet of the World is a wide ranging Tablet in which Baha’u’llah addresses many very important concerns. It may be read here.