Just some notes to follow, Bobby -
After the Fall, we have the restoration of the Spirit by a remedial economy all through the OT. The Spirit was lost by the Fall (upon one sin) and He is to be regained in the OT by a "temporary means" until the Messiah may send Him from the procession of His Messianic throneroom.
Prophets in the OT were all filled with the Spirit (1 Peter 1:11).
The Spirit was less imparted than from the procession of the Messianic enthronement in the NT, but the same impartation of salvation and power remians in both testaments. there are not two classes of Christians.
Paul says we have the same spirit of faith -
2 Corinthians 4:13 And since we have the same spirit of faith, according to what is written, "I believed and therefore I spoke," we also believe and therefore speak" where Paul was quoting Psalm 116:10.
In every age, the Spirit is given for service and empowerment (after salvation of course).
Have you read the books for the Holy spirit class yet? Smeaton is helpful.