Rashi on Exodus 28:26/רש"י על שמות כ״ח:כ״ו

1על שני קצות החשן IN THE TWO EXTREMITIES OF THE BREAST-PLATE — These are its two lower corners on the right and on the left.

2על שפתו אשר על עבר האפוד ביתה ON THE BORDER THEREOF WHICH IS ON THE OTHER SIDE OF THE EPHOD INWARD — Here you have two indications of the position of the rings: one, that he should place them on the two ends of the lower edge, for it was this which was over against the ephod, because its upper edge was not over against the ephod since it was close to the neck and the ephod was placed a little above his loins (consequently the upper edge of the breastplate which was near the priest’s neck was nowhere near the ephod which was girded round him just above the loins. See Rashi on v. 7). It gives another indication by the use of the word ביתה : that, he should not fix them on that side of the breast-plate which faced outside, but on that side which faced inward, because it is said ביתה, inward. It was that side which was turned toward the ephod, for the ends of the lower edge of that side of the breast-plate really lay upon the ephod since the priest tied the belt of the ephod around him and the apron was folded over in front of the priest upon his loins and upon a part of his stomach on both sides as far as against the ends of the breast-plate (i. e. the corners of the lower edge), the ends of which lay upon it.