The eternal God became the temporal God and then became the eternal God again.
“And unto the angel of the church of the Laodiceans write; These things says the Amen, the faithful and true witness, the beginning of the creation of God;” (Revelation 3:14)
“When Jesus knew in Himself that His disciples murmured at it, He said unto them, Does this offend you? What and if you shall see the Son of man ascend up where He was before?” (John 6:61-62)
“For with God nothing shall be impossible.” (Luke 1:37)