As far as Moses knew out of nowhere while shepherding his father-in-law 's flock,
 God enters the picture

 Below are artists conceptions of how according to Exodus 3:1-6 ... 1 Spanish, 1 American, 1 Flemish  and 2 Italian spanning 6 centuries.

Moses and the Burning Bush
Moses on Holy Ground with Burning Bush
by Dirck Bouts Flemish 1415-1475

Moses at the Burning Bush
Moses kneeling before the Burning Bush
by Arnold Friberg American 1956 contemporary

The Burning Bush
by Francisco Collantes Spanish 1635

Moses Before the Burning Bush
Moses Removing his Sandles at the Burning Bush
by Domenico Feti Italian 1613-14

Moses hiding face from God
Moses hiding face from God
by Tintoretto Italian 1518-1594

Read Exodus chapters 3 and 4
Special attention to 3:1-6



  Moses' Calling  was it a

 A. Command   B. Request   C. Opportunity  ?

.       .       .       .
1.  God got Moses attention.          a bush in flames but not burning up something impossible as far as Moses was concerned        Exodus 3:2-4
2.  God spoke.                             Moses had no doubt that it was God speaking because of  #1.                                            Exodus 3:4
3.  God said.  "Moses Moses"       repetition I believe places great emphasis or importance to the meeting.     reference Revelations 18:2  "And he cried mightily with a strong voice,
                                                                                                                                                                                                                                         saying, Babylon the great is fallen, is fallen 
                                                                                                                                                                                                                                         and is become the habitation of devils, and
                                                                                                                                                                                                                                         the hold of every foul spirit..."
4.  Moses said.    "Here am I"       states his availability                                                                      reference Isaiah 6:8    "Also I heard the voice of the Lord, saying, Whom
                                                                                                                                                                                                                               shall I send, and who will go for us? Then said I,
                                                                                                                                                                                                                               HERE AM I; send me" Isaiah
5.  God said.  "Put off thy shoes"  emphasis on respect even as far as the ground surrounding God                                         Exodus 3:5
6.  God said   "I am the God of thy father, the God of Abraham, the God of Isaac, and the God of Jacob."   identification                  Exodus  3:6
     Moses hid face.
     Moses was afraid to look upon God.    Why?  
.       .       .       .

             A.  He was showing respect    B.  He was frightened    C. He was unworthy                             

                                                                                      to continue click the picture below

Moses receiving plan
Moses talking with God
by LaHaye 1728