Which was a figure for the time then present, in which were offered both gifts and sacrifices, that could not make him that did the service perfect, as pertaining to the conscience; Which - Tabernacle and its services, was a figure, παραβολη, a dark enigmatical representation, for the time then present - for that age and dispensation, and for all those who lived under it.
In which, καθ' ὁν, during which, time or dispensation were offered both gifts and sacrifices - eucharistic offerings and victims for sin, that could not make him that did the service, whether the priest who made the offering, or the person who brought it in the behalf of his soul, perfect as pertaining to the conscience - could not take away guilt from the mind, nor purify the conscience from dead works. The whole was a figure, or dark representation, of a spiritual and more glorious system: and although a sinner, who made these offerings and sacrifices according to the law, might be considered as having done his duty, and thus he would be exempted from many ecclesiastical and legal disabilities and punishments; yet his conscience would ever tell him that the guilt of sin was still remaining, and that it was impossible for the blood of bulls and goats to take it away. Thus even he that did the service best continued to be imperfect - had a guilty conscience, and an unholy heart.
The words καθ' ὁν, in which, referred in the above paraphrase to τον καιρον, the time, are read καθ' ἡν by ABD, and several others, one copy of the Slavonic, the Vulgate, and some of the fathers, and thus refer to την σκηνην, the tabernacle; and this is the reading which our translators appear to have followed. Griesbach places it in his margin, as a very probable reading; but I prefer the other.