John Chrysostom
Further, so that you may know that the word "liturgical minister" is used with reference to Christ's humanity, see how he explains this further.
"Every high priest," he says, "is appointed to offer gifts and sacrifices; therefore it was necessary that this One also have something to offer."
When you hear that Christ sits, do not think that He has been unjustly called High Priest. The first, namely sitting, is a sign of divine dignity. The latter is a sign of great love for mankind and care for us.
For this reason the Apostle enlarges on the latter and speaks of it in greater detail, fearing lest he diminish the former. Therefore he now directs his discourse to this very point.
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Some were asking: why did Christ die, being a priest? A priest is not without an offering of sacrifice. Therefore He too had to offer sacrifice.
Again, since he said that Christ is "higher than the heavens," he now says and proves that He is priest in every respect: according to Melchizedek, according to the oath, and according to the offering of sacrifice.
From this he draws another necessary conclusion: "If He were on earth," he says, "He would not be a priest, since there are priests here who offer gifts according to the law."