Overlay it with pure gold both inside and out, and make a gold molding around it.
The first thing which is here ordered to be made is the ark with its appurtenances, the furniture of the most holy place, and the special token of God's presence, for which the tabernacle was erected to be the receptacle. I.
Commenting on Exodus 25:10-22
And thou shalt overlay it with pure gold,.... Not gild it, but put a plate of pure gold over it: within and without shalt thou overlay it; so that nothing of the wood could be seen: this may denote the glory of Christ in both his natures, divine and human, the riches of his person and office, which are unsearchable and durable, and his preciousness...
A crown of gold round about - A border, or, as the Septuagint have it, κυματια χρυσα στεπτα κυκλω, waves of gold wreathed round about.