Jesus coming back: descending from the clouds
The next two verses cover the return and eternal being [eternity] of Jesus Revevelation 1:7-8.
The same way he went to heaven as in Acts 1:9-11 and Luke 23:50-53 He will be coming back.
Jesus went back to heaven so he could send the Holy Spirit who would help us.
The Holy Spirit is a person and is the third person of the trinity.
Background Reading:
Revelation 1:4-8
Jesus coming back: descending from the clouds
7 Look, he is coming with the clouds,
and every eye will see him,
even those who pierced him;
and all the peoples of the earth will mourn because of him. So shall it be! Amen.
8 "I am the Alpha and the Omega," says the Lord God, "who is, and who was, and who is to come, the Almighty."