Hebrews 9:12
“Neither by the blood,” he says, “of goats and calves” (All things are changed) “but by His own Blood” (he says) “He entered in once for all into the Holy Place.” See thus he called Heaven. “Once for all” (he says) “He entered into the Holy Place, having obtained eternal redemption.” And this [expression] “having obtained,” was [expressive] of things very difficult, and that are beyond expectation, how by one entering in, He “obtained everlasting redemption.”
Source: Homilies on the Epistle to the Hebrews (New Advent)