BDB6596
פֶּ֫טֶר noun [masculine] that which separates, first opens; — construct, רֶחֶם ׳ פּ i. e. firstborn, of man and beast, Ezek 20:26; Exod 13:12; Exod 13:15; Exod 34:19; Num 18:15 appositive בְּכוֺר Exod 13:2; Num 3:12 רֶחֶם omitted Exod 13:12; Exod 13:13; Exod 34:19; Exod 34:20.