Shemot 26:21-23

Orthodox Jewish Bible

²¹ And their arba’im sockets of kesef; two sockets under one keresh (plank), and two sockets under the next keresh (plank).

²² And for the back of the Mishkan on the west, thou shalt make six kerashim (planks).

²³ And two kerashim (planks) shalt thou make for the corners of the Mishkan in the rear.