Mischna zu Schemot 30:18
וְעָשִׂ֜יתָ כִּיּ֥וֹר נְחֹ֛שֶׁת וְכַנּ֥וֹ נְחֹ֖שֶׁת לְרָחְצָ֑ה וְנָתַתָּ֣ אֹת֗וֹ בֵּֽין־אֹ֤הֶל מוֹעֵד֙ וּבֵ֣ין הַמִּזְבֵּ֔חַ וְנָתַתָּ֥ שָׁ֖מָּה מָֽיִם׃
Mache ein Becken von Kupfer und sein Gestell von Kupfer zum Waschen und setze es zwischen das Stiftszelt und den Altar, und thue Wasser darein.
Mishnah Middot
The laver was between the porch and the altar, a little to the south. Between the porch and the altar there were twenty-two cubits. There were twelve steps there, each step being half a cubit high and a cubit broad. There was a cubit, a cubit and a level space of three cubits, then a cubit, a cubit and a level space of three cubits, then at the top a cubit, a cubit and a level space of four cubits. Rabbi Judah says that at the top there was a cubit, a cubit and a level space of five cubits.
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