Exodus 3:14, Take your sandals off. In the Orient, it is common to take off one’s shoes before entering a house, since typically would sit on a mat or a rug (as opposed to a chair). To keep these mats from getting soiled by dirt, sandals were left outside. The idea of defilement from the shoes led to the custom of removing shoes when entering sacred place, which the Moslems practice to this day when entering a mosque. It is because of this, that the Messenger of YHVH asked Moses to take off his sandals at the burning bush.