Sefer HaYashar
Fourteenth, to set in proper order his food, his drink, his pleasures, and his chariot37. Professor Y. Dan suggested that Merchavto might possibly be read Harchavto, his nature. The word is used in an earlier sense in Lev. 15:9 "And what saddle soever he that hath the issue rideth upon shall be unclean." See also Mishnah Kelim 23:3..