जो किया वह

what … did

→ जो
phrase Rare #7,087
what … did A relative-correlative construction: जो introduces what someone did, and वह refers back to it in the main clause.
HI: उसने जो किया वह सही था।
EN: What they did was right.

आपने जो किया वह केवल एक सच्चा दोस्त करेगा।

What you did is something only a true friend would do.

— दि हॉबिट: अंतिम अध्याय (2014)