Isaiah 58:13 If thou turn away thy foot from the sabbath, from doing thy pleasure on my holy day; and call the sabbath a delight, the holy of the LORD, honourable; and shalt honour him, not doing thine own ways, nor finding thine own pleasure, nor speaking thine own words: 14 Then shalt thou delight thyself in the LORD; and I will cause thee to ride upon the high places of the earth, and feed thee with the heritage of Jacob thy father: for the mouth of the LORD hath spoken it.
Exodus 20:9 Six days shalt thou labour, and do all thy work: 10 But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates: 11 For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.
"During the reign of Benedict XVI in 09, Piper was asked on video if he had two minutes to question the Pope on an issue, what would he ask, and he chose the subject of justification.
"I think Rome and Protestantism are not yet ready â€“ I don't think the Reformation is over..." he said in the video.
"He then proceeded to detail the question he would ask the Pope. "'Do you teach that we should rely entirely on the righteousness of Christ imputed to us by faith alone as the ground of God being 100% for us, after which necessary sanctification comes? Do you teach that?'" he said in the clip.
"And if he said, 'No, we don't,' then I'd say, 'I think that right at the core of Roman Catholic theology is a heresy,' or something like that," he added.
"In a new post on Thursday, however, Piper conceded that 'heresy' is a strong word and attempted a more nuanced explanation of what he meant by his comments.
"I am thankful that God is willing to save us even when our grasp of the gospel may be partial or defective."
For Piper, as of today, the Reformation is officially over.