Exodus 37:13

13 And at the second back on this side and on that by the gate of the court, curtains of fifteen cubits, their pillars three and their sockets three;

Exodus 37:13 In-Context

11 And on the east side curtains of fifty cubits of fifteen cubits behind,
12 and their pillars three, and their sockets three.
13 And at the second back on this side and on that by the gate of the court, curtains of fifteen cubits, their pillars three and their sockets three;
14 all the curtains of the tabernacle of fine linen twined.
15 And the sockets of their pillars of brass, and their hooks of silver, and their chapiters overlaid with silver, and all the posts of the court overlaid with silver:

The Brenton translation of the Septuagint is in the public domain.