Gen 28:12-14,17, Jn 2:19-21, Jn 14:6
In the Old Testament, Jacob saw angels ascending and descending on a ladder that stood on the ground. God also blessed Jacob on the ladder. And Jacob confessed that it was the house of God and the gate of heaven. (Gen 28:12-14, 17)
Gen 28:12 And he dreamed, and behold a ladder set up on the earth, and the top of it reached to heaven: and behold the angels of God ascending and descending on it. 13 And, behold, the Lord stood above it, and said, I am the Lord God of Abraham thy father, and the God of Isaac: the land whereon thou liest, to thee will I give it, and to thy seed; 14 And thy seed shall be as the dust of the earth, and thou shalt spread abroad to the west, and to the east, and to the north, and to the south: and in thee and in thy seed shall all the families of the earth be blessed. 17 And he was afraid, and said, How dreadful is this place! this is none other but the house of God, and this is the gate of heaven.
Jesus revealed that He was the gate of heaven. (Jn 1:50-51, Jn 14:6)
Jn 1:50 Jesus answered and said unto him, Because I said unto thee, I saw thee under the fig tree, believest thou? thou shalt see greater things than these. 51 And he saith unto him, Verily, verily, I say unto you, Hereafter ye shall see heaven open, and the angels of God ascending and descending upon the Son of man.
Jn 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
Jesus also revealed that He was the true temple. (Jn 2:19-21)
Jn 2:19 Jesus answered and said unto them, Destroy this temple, and in three days I will raise it up. 20 Then said the Jews, Forty and six years was this temple in building, and wilt thou rear it up in three days? 21 But he spake of the temple of his body.