EPH. 4:4-5-6.
There is one body, and One Spirit, even as you are called in one hope of your calling;
One Lord, one faith, one baptism,
One God and Father of all, Who is above all, and through all, and in you all.
1PETER 8-9-10-11.
Whom having not seen, you Love; in Whom, though now ye see Him not, yet believing,
you rejoice with joy unspeakable and full of glory:
Receiving the end of your faith, even the salvation of your souls.
Of which salvation the prophets have enquired and searched diligently, who prophesied
of the grace that should come unto you:
Searching what, or what manner of time The Spirit of Christ which was in them did signify,
when it testified beforehand the sufferings of Christ, and the glory that should follow.
Jesus Christ and The Holy Spirit are ALL OVER the OT - that is where the NT apostles preached
the Gospel from'...
the point is:
there is only One Spirit and The Spirit of Christ dwelt in ALL of His prophets...