Ryrie states:
“. . . although the Spirit did indwell men in Old Testament times, it was a selective ministry, both in regard to whom He indwelt and for how long. Can this relationship be summarized in any simple way? Yes, for the Lord summarized it by telling His disciples that up to that time the Spirit had been abiding with them, though on and after the day of Pentecost He would be in [Italics added] them (John 14:17).”
Lest it be confusing, the Holy Spirit did fill various people in the OT times, a transient interaction in contrast to the permanent indwelling of repentant believers when they are saved and experience the baptism of the Holy Spirit. Later blogs will elaborate on this point, acknowledging that the infilling continues to this day.