Shemot 26:19-21

Orthodox Jewish Bible

¹⁹ And thou shalt make arba’im sockets of kesef under the twenty kerashim (planks); two sockets under one keresh (plank) for its two yadot (tenons, projections), and two sockets under the next keresh (plank) for its two yadot.

²⁰ And for the second wall of the Mishkan on the tzafon (north) side there shall be twenty kerashim (planks):

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