Exodus 25:10 (KJV)
And they shall make an ark of shittim wood two cubits and a half shall be the length thereof and a cubit and a half the breadth thereof and a cubit and a half the height thereof
And they shall make an ark of shittim wood two cubits and a half shall be the length thereof and a cubit and a half the breadth thereof and a cubit and a half the height thereof