Hebrews 10:11-14:

Καὶ πᾶς μὲν ἱερεὺς ἕστηκεν καθ' ἡμέραν λειτουργῶν καὶ τὰς αὐτὰς πολλάκις προσφέρων θυσίας, αἵτινες οὐδέποτε δύνανται περιελεῖν ἁμαρτίας. οὗτος δὲ μίαν ὑπὲρ ἁμαρτιῶν προσενέγκας θυσίαν εἰς τὸ διηνεκὲς ἐκάθισεν ἐν δεξιᾷ τοῦ θεοῦ, τὸ λοιπὸν ἐκδεχόμενος ἕως τεθῶσιν οἱ ἐχθροὶ αὐτοῦ ὑποπόδιον τῶν ποδῶν αὐτοῦ· μιᾷ γὰρ προσφορᾷ τετελείωκεν εἰς τὸ διηνεκὲς τοὺς ἁγιαζομένους.

Here is the NRSVUE’s rendering:

And every priest stands day after day at his service, offering again and again the same sacrifices that can never take away sins. But when this one had offered for all time a single sacrifice for sins, “he sat down at the right hand of God,” and since then has been waiting “until his enemies would be made a footstool for his feet.” For by a single offering he has perfected for all time those who are sanctified.

As I was working my way (slowly) through the Greek of this passage yesterday, I initially read the bolded phrase as modifying Christ’s sitting, not his offering. That is to say, he sat down in perpetuity. DBH disagrees with me, as do most translations, but Wycliffe, Darby, and NABRE all agree with me. So I reached out to Paul Sloan to see what he thought.

I remarked that it seems to me that perpetual seatedness of Christ contrasts with the perpetual standing of the Levitical priests, whereas the singularity (and thus the non-perpetualness) of the sacrifice is taken care of by its “oneness,” reiterated in both verse 12 (μίαν ὑπὲρ ἁμαρτιῶν προσενέγκας θυσίαν ) and verse 14 (μιᾷ γὰρ προσφορᾷ). In the latter instance, though, we have no reiteration of εἰς τὸ διηνεκὲς.

Paul observed that this reading makes for a nice and neat ABBA structure:

A. They stand daily (ἕστηκεν καθ' ἡμέραν)
B. Making many sacrifices (τὰς αὐτὰς πολλάκις προσφέρων θυσίας)
B. Christ made a single sacrifice
A. And sat down forever

And now all he has to do is wait to prop up his (already resting) feet on the backs of his enemies.