Exodus 26:23

26:23 You are to make two frames for the corners ¹  of the tabernacle on the back.

Exodus 36:28

36:28 He made two frames for the corners of the tabernacle on the back.

Exodus 36:30

36:30 So there were eight frames and their silver bases, sixteen bases, two bases under each frame.

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¹ sn The term rendered “corners” is “an architectural term for some kind of special corner structure. Here it seems to involve two extra supports, one at each corner of the western wall” (N. M. Sarna, Exodus [JPSTC], 170).