Ezek 41:4

וַיָּ֨מָד אֶת־אָרְכּ֜וֹ עֶשְׂרִ֣ים אַמָּ֗ה וְרֹ֛חַב עֶשְׂרִ֥ים אַמָּ֖ה אֶל־פְּנֵ֣י הַֽהֵיכָ֑ל וַיֹּ֣אמֶר אֵלַ֔י זֶ֖ה קֹ֥דֶשׁ הַקֳּדָשִֽׁים׃

Then he measured the room adjacent to the inner sanctuary to be twenty cubits long and twenty cubits wide. And he said to me, “This is the Most Holy Place.”