Exodus 25:16-22 describes the ark and mercy seat, which is the 'testimony' where the rods were laid.

Exodus 30:6 also mentions meeting before the testimony, directly matching the location and phrase used here.

Exodus 30:36 repeats 'before the testimony, where I will meet with you'—identical phrasing to this verse.

Exodus 25:22 says 'I will meet with you' above the mercy seat—the same promised meeting place as here.