Ezekiel 40:6-7

6Then he came to the gate that faced east and climbed its steps. He measured the threshold of the gate; it was 10½ feet deep — one threshold was 10½ feet deep.

7Each recess was 10½ feet long and 10½ feet deep, and there was a space of 8¾ feet between the recesses. The inner threshold of the gate on the temple side next to the gate’s portico was 10½ feet.