海内存知己，天涯若比邻

Explanation: Bosom friend within the four seas, even far away, it feels as close as neighbors. 　　Usage: Complex sentence; as object; with compliment 　　Source: Tang Wang Bo, "the House of any Shu Du Chau": "Italy and the king farewell, the same official all people; bosom friend, stands for ever. Inaction in the Crossroads, children were stained towel." Thesaurus:  a friend until death, A friend in need is a friend indeed., ties between friends willing to sacrifice even life for each other, Sworn brothers and sisters The contract, Very friendly Heart, click, Qingshenyihou, Yi Results sworn brothers and sisters Antonym Group:  only slightly acquainted with (a person), have met only once, Side of the Ya, To sever friendship Sub-Block, Guan Ning to sever friendship