The thornbush has a special meaning in the Bible. When the Sadducees were debating with the Lord concerning resurrection, the Lord said, “Concerning the dead, that they are raised, have you not read in the book of Moses, in the section concerning the bush, how God spoke to him, saying, ‘I am the God of Abraham and the God of Isaac and the God of Jacob’? He is not the God of the dead, but of the living” (Mark 12:26-27). The Lord Jesus referred to the thornbush in Exodus 3 when speaking concerning resurrection. As those who have been gained and are being used by God, we are a thornbush according to our old, natural man. However, there is a fire in us; God has come to us in the fire. The God of resurrection, the life of resurrection, and the glory of resurrection have come to the natural man.
The holy fire of God coming to the thornbush means that God came forth to be among His chosen people….The Angel who came to the earth was Jesus Christ, the One who was sent by God and is God. Verse 8 says, “I have come down to deliver them out of the hand of the Egyptians.” Where did He “come down” to? He came down to the thornbush. When the God of resurrection came forth as the Angel of Jehovah, He came forth in His Son, Christ Jesus, the One whom He sent. He came forth in the form of fire in the thornbush, man. (The Operation of God and the Anointing, ch. 11, by Witness Lee)