"The Holy Ghost this signifying, that the way into the holiest of all was not yet made manifest, while as the first tabernacle was yet standing" (Heb. 9.8 KJV).

"By these regulations the Holy Spirit revealed that the entrance to the Most Holy Place was not freely open as long as the Tabernacle and the system it represented were still in use" (Heb. 9.8 NLT).

The Holy Spirit did not indwell believers during the OT, nor when the OT rituals were still in use.