Genesis 6:15

And thus shalt thou make it: let the length of the ark be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits.

Genesis 7:20

Fifteen cubits upward the waters prevailed; and the mountains were covered.

Deuteronomy 3:11

For only Og the king of Bashan remained of the residue of giants: behold, his bedstead was a bedstead of iron; is it not in Rabbah of the children of Ammon? its length was nine cubits, and its breadth four cubits, after the cubit of a man.

Treasury of Scripture Knowledge

Summary

And this is the fashion which thou shalt make it of: The length of the ark shall be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits.

Bible References

Cubits

Genesis 7:20
Fifteen cubits upward the waters prevailed; and the mountains were covered.
Deuteronomy 3:11
For only Og the king of Bashan remained of the residue of giants: behold, his bedstead was a bedstead of iron; is it not in Rabbah of the children of Ammon? its length was nine cubits, and its breadth four cubits, after the cubit of a man.