1 Samuel 5:5

Henceforward, therefore, his priests and other worshippers carefully abstained from treading on the door sill, where his nobler members had lain, unto this day. Apparently the Books of Samuel were written some time after the events recorded in them took place, and we have remarkable evidence of the permanence of the custom in Zephaniah 1:9 , where the Philistines are described as "those that leap on," or more correctly over, "the threshold." The custom, so curious in itself and so long continued, bears strong testimony to the historical truth of the narrative.