JMNT(i)
12 Yet on the other hand this One, after at one point offering one sacrifice – stretched for the whole length – over [the situation of] sins (or: on behalf of failures and errors), sat within the right [part or side] of God (or: at the right [hand] of God; centered in God's [place of power, honor and acceptance]) on into the whole length (or: extended into the unbroken continuance),
13 continuously, one after another, taking hold with the hand to embrace and welcome from out of the rest (the remaining and leftover) until the hated ones that belong to Him (His enemies; the ruiners that He has; folks who are hostile in relation to Him) can be placed [as] a footstool of His feet (= would be set in a humble and supportive position in relation to His body).
14 For you see, by and in one offering He has perfected (brought to the goal; matured; completed; finished; brought to their purposed destiny) – on into the whole length (or: extended or stretched into the unbroken continuance) – those folks being one after another set-apart (separated; made sacred and holy; [p46 reads: restored back up again into the original state and condition; rescued back and delivered again; made healthy and whole again]).