Before the testimony means before the ark, and that ark was an express type of JESUS. It is delightful to discover everything referring to our JESUS. Hence David sings, Arise, O LORD, into thy rest: thou, and the ark of thy strength. Psalms 132:8.
Related Commentaries of Numbers 17:4
Numbers 17:4
4 And thou shalt lay them up in the tabernacle of the congregation before the testimony, where I will meet with you.