Wilford Woodruff preaches observance of WoW.
Journal History of the Church, October 6, 1883; CHL, CR 100 137
The Presidency were able to preach the whole law of God, and they practised what they preached. They were an example to others. No man in this kingdom had a right to preach that which he did not practice. He himself did not feel at liberty to preach the Word of Wisdom unless he observed it. In this respect the Apostles felt desirous of emulating the example of the First Presidency. But it should not stop here. All other quorums should do likewise, for the time was at hand when it would be necessary to keep the whole law of God, for there would be a dividing line, separating those who did from those who did not.