This icon depicts Abraham sacrificing his son Isaac. It uses the encaustic technique on the marble revetment of the left pilaster supporting the apse of the sanctuary of the Monastery of St. Catherine's main church (Katholikon). Its date is unsure, though probably before the 7th century. Read more: http://www.touregypt.net/featurestories/catherines2-4.htm#ixzz35qFm1JAr
Moses and the Burning Bush, Byzantine Mosaic St Catherine's Monastery, Mt Sinai, Egypt. Built on the site where Moses received the 10 Commandments from God. The altar of the church was built over roots of the burning bush.
There is at least one icon from Mt. Sinai that even people far from the Church know: the famous Christ Pantocrator, one of the most ancient iconographic depictions of Christ, painted in Constantinople in the mid-sixth century and given to the monastery at Mt. Sinai.