God had barely given the Law to Moses when He ordered that it be put in a coffin. Thatβs right β a coffin. The reason for this is that the Mosaic covenant clearly stipulated:
βNow therefore, IF YE WILL OBEY MY VOICE INDEED, and keep My covenant, THEN ye shall be a peculiar treasure unto Me above all people, for all the earth is Mineβ (Ex. 19:5).
Israel, of course, did not obey Godβs voice indeed, but broke the Law before Moses even got down from Sinai. It was because of this that God, in grace, commanded: βAnd they shall make an arkβ¦β (Ex. 25:10). This word βarkβ is rendered βcoffinβ in the last verse of Genesis and that is its simple meaning. But why did God order a coffin as the very first article of furniture for the tabernacle? The answer is: To put the Law in. Read it for yourself:
βAnd thou shalt put into the COFFIN the testimony [the Law] which I shall give theeβ¦ and thou shalt put the MERCY SEAT above upon the coffinβ¦β (Ex. 25:16,21).
If God had not put the covenant of the Law in a coffin and met His people from a βmercy seatβ none of them ever would have been saved.
This Old Testament type has a lesson for us today, for if God dealt with us according to our works none of us would ever be saved, but βChrist died for our sins,β meeting for us the just demands of a broken Law, so that we might be saved by grace through faith in His redemptive work.
Thus believers in Christ are saved βby graceβ¦ through faithβ¦ not of worksβ but βunto good works, which God hath before ordained that we should walk in themβ (Eph. 2:8-10). source