Parashas Terumah · Passuk 25:10
Yerushalmi Shekalim 6:1
English: Rabbi Yochanan says that the cubit here is six handbreadths; therefore the Ark was fifteen handbreadths long, nine handbreadths wide, and nine handbreadths high.
What Is Learned: The Yerushalmi calculates the Ark's dimensions using a six-handbreadth cubit.