The length of a board was ten cubits, and the breadth of a board one cubit and a half.
A description of the construction materials for the tabernacle.
King James Version (public domain)
Traditionally attributed to Moses · c. 13th century BC · The Pentateuch — Genesis, Exodus, Leviticus, Numbers, and Deuteronomy — is traditionally attributed to him
19And he made a covering for the tent of rams’ skins dyed red, and a covering of badgers’ skins above that.
20And he made boards for the tabernacle of shittim wood, standing up.
21The length of a board was ten cubits, and the breadth of a board one cubit and a half.
22One board had two tenons, equally distant one from another: thus did he make for all the boards of the tabernacle.
23And he made boards for the tabernacle; twenty boards for the south side southward: