We read in, John 1:47-51;
When Jesus saw Nathanael approaching, He said of him, “Here is a true Israelite, in whom there is nothing false.”
“How do you know me?” Nathanael asked.
Jesus answered, “I saw you while you were still under the fig tree before Philip called you.”
Then Nathanael declared, “Rabbi, you are the Son of God; you are the King of Israel.”
Jesus said, “You believe because I told you I saw you under the fig tree. You shall see greater things than that.”
He then added, “I tell you the truth, you shall see heaven open, and the angels of God ascending and descending on the Son of Man.”
Heaven open - This is an expression, denoting “the conferring of favors.”
“He opened the doors of heaven, and had rained down manna.”
It also denotes that God was about to work a miracle in attestation of a particular thing.
“As soon as Jesus was baptized, He went up out of the water. At that moment heaven was opened, and He saw the Spirit of God descending like a dove and lighting on Him.”
In the language, here, there is an evident allusion to the ladder that Jacob saw in a dream, and to the angels ascending and descending on it, Genesis 28:12. The baptism of Jesus had taken place, and no other instance occurred in His life in which it is said that the “heavens were” opened.
Angels of God - Those pure and holy beings that dwell in heaven and that are employed as ministering spirits to our world, Hebrews 1:14. Good men are represented in the Scriptures as being under their protection, Psalm 91:11-12; Genesis 28:12.
They are the agents by which God often expressed His will to men, Hebrews 2:2. They are represented as strengthening the Lord Jesus, and ministering unto Him. Thus they aided Him in the wilderness Mark 1:13, and in the garden Luke 22:43, and they were present when Jesus rose from the dead, Matthew 28:2-4.
Thus Christ’s life, His many deliverances from dangers, His wisdom to confute His skilled and cunning adversaries, the scenes of His death, and the attendance of angels at His resurrection, may all be represented by the angels descending upon him, and all would show to Nathanael and the other disciples most clearly that He was truly the Son of God.