וַחֲמֵ֨שׁ עֶשְׂרֵ֥ה אַמָּ֛ה קְלָעִ֖ים לַכָּתֵ֑ף עַמֻּדֵיהֶ֣ם שְׁלֹשָׁ֔ה וְאַדְנֵיהֶ֖ם שְׁלֹשָֽׁה׃
The hangings for the one side [of the gate] shall be fifteen cubits: their pillars three, and their sockets three.
Targum Jonathan on Exodus
and fifteen cubits the hangings of the side, their pillars three and the their foundations three.