Pinyin: yàn kāi zhī jǐng j ǐ ng j ǐ ng
Interpretation: Yan, it's getting late. If there is an emergency, the door will open late. Describe that times are not peaceful.
Source: Biography of Geng Guo in the Later Han Dynasty: "Make the east humble, the north reject the Hungarian mother, attract four foreigners, and finish the border county, so that there is no police in the fortress."