道义之交 (dào yì zhī jiāo): A friendship based on shared moral principles and a sense of justice — Meaning & Stroke Order

True friends should be principled friends, not fair-weather friends.

The two of them are principled friends who have been through many difficult times together.

In the business world, they formed a principled friendship, supporting each other without expecting anything in return.

Their principled friendship was tested in the face of personal gain and remained strong.