Exodus 38:1-7
And he made the altar of burnt offering of shittim wood: five cubits was the length thereof, and five cubits the breadth thereof; it was foursquare; and three cubits the height thereof.
Nave's Topical Index—AKJV

Exodus 37:1
And Bezaleel made the ark of shittim wood: two cubits and a half was the length of it, and a cubit and a half the breadth of it, and a cubit and a half the height of it:
Nave's Topical Index—AKJV