Hebrews 10:14-15
“But this [man] after He had offered one sacrifice for sins for ever, sat down on the right hand of God, from henceforth expecting till His enemies be made His footstool.” “For by one offering He has perfected forever them that are sanctified. Whereof the Holy Ghost also is a witness to us.” He had said that those [sacrifices] are not offered; he reasoned from what is written, [and] from what is not written; moreover also he put forward the prophetic word which says, “sacrifice and offering You would not.” He had said that He had forgiven their sins.
Source: Homilies on the Epistle to the Hebrews (New Advent)