Things have changed since OT times. Now when a person dies physically he is then with the lord Jesus in heaven:
"For I am in a strait betwixt two, having a desire to depart, and to be with Christ; which is far better" (Phil.1:23).
That is why we see men in heaven after their death:
"And immediately I was in the spirit: and, behold, a throne was set in heaven, and one sat on the throne. And he that sat was to look upon like a jasper and a sardine stone: and there was a rainbow round about the throne, in sight like unto an emerald. And round about the throne were four and twenty seats: and upon the seats I saw four and twenty elders sitting, clothed in white raiment; and they had on their heads crowns of gold" (Rev.4:2-4).
Not even Christ went to Heaven immediately that He died.
The saints are in their graves, if they have died before Jesus returns.
1Th 4:16 For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and
the dead in Christ shall rise first:
1Co 15:20 But now is Christ risen from the dead, and become the firstfruits of them that slept.
1Co 15:21 For since by man came death, by man came also the resurrection of the dead.
1Co 15:22 For as in Adam all die, even so in Christ shall all be made alive.
1Co 15:23 But every man in his own order: Christ the firstfruits; afterward they that are Christ's at his coming.
Even after their resurrection, the saints will not go to Heaven--
Joh 14:2 In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.
Joh 14:3 And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.
Christ returns, gathers His saints, and they are in the air.
No going into the Heaven, yet.
Mat 24:27 For as the lightning cometh out of the east, and shineth even unto the west; so shall also the coming of the Son of man be.
Mat 24:28 For wheresoever the carcase is, there will the eagles be gathered together.
LA