The comforter which is the Holy Ghost was not given until Jesus had ascended. How then do you explain Isaiah 63:11 when God put the Holy Spirit within Moses?
The Holy Spirit is
God the Holy Spirit, and was with the Father, and with the Son since eternity past. Then we see the Holy Ghost at work at the very beginning of creation (
"And the Spirit of God moved upon the face of the waters" Gen 1:2). and is subsequently mentioned throughout the Old Testament.
While the OT saints were justified by grace through faith, the Holy Spirit was not given as a gift to every believer under the Old Covenant, and could come and also depart from individuals. Moses and David both received the Spirit, as did most of the prophets, since when they spoke or wrote they were "moved by the Spirit".
However, God had promised to give the gift of the Holy Spirit to each and every believer within the New Covenant (and you will find this within the details of the New Covenant)
. He would also be the Paraclete or Comforter for every believer, meaning that Christ would not leave His people as orphans on earth. The Holy Ghost would become the indwelling Holy Spirit, never to depart from any believer.
At the same time, the Holy Spirit had a specific ministry on earth for the Gospel Age, but He could not be *poured out* upon all flesh
until and unless Christ had finished His work of redemption, been resurrected, and also ascended to Heaven. And it was only after the ascension of Christ that both the Father and the Son could send down the Holy Spirit as promised.
Furthermore, there would be a specific day (the day of Pentecost) on which the Holy Spirit would come to earth in great power, in order to be given as a gift to everyone who believed. That is when the New Testament saints would be regenerated, receive the gifts of the Spirit, be "filled with the Spirit", and be empowered by the Spirit in order to "walk in the Spirit". The Spirit would also baptize believers into the Body of Christ, thus forming a new entity called "the Church" (with Jew and Gentile in one Body). This too was a mystery hidden from the OT prophets.
Just as Christ was crucified on the day of
Passover, and resurrected on the
Feast of First Fruits, the Holy Spirit was sent 50 days after Passover
on the day of Pentecost to signify that the harvest feast of Pentecost was fulfilled on that day. But rather than a harvest of grains, there was a harvest of souls. And souls have been saved ever since by the preaching of the Gospel and
the convincing and convicting power of the Holy Spirit. Both are SUPERNATURAL AGENTS to bring sinners to the Savior and complete the Church.