TgJ Jud19:27 :וְהָא אִתְתָא לְחֵינְתֵיה רָמיָא בִתרָע בֵיתָא וִידַהָא מַחְתָן עַל סִפָא‏ : there was his concubine-wife lying thrown down at the house's entrance with her hands fallen on the threshold
See the entire entry for sap̄, seppā n.m. threshold