There are the Nine Promises from Our Lord to those who practice Devotion to the Holy Face. These promises were collated in the 1880s by the original propagators of the Devotion. The first two are promises given to Saint Gertrude and Saint Mechtilde and the remaining seven were given by Our Lord to Sister Marie de Saint-Pierre:
1. “They shall receive in themselves by the impression of My Humanity, a bright irradiation of My Divinity, and shall be so illuminated by It in their and most souls, they buy their inmost souls, that by their likeness to My Face, they shall shine more than any others in eternal life. [Saint Gertrude, Insinuations, Book IV, Ch. VII]
2. Saint Mechtilde asked Our Lord if those who celebrate the memory of His Holy Face should never be deprived of His amiable company. Our Lord replied, “Not one of them shall be separated from Me. “ [Saint Mechtilde, `Of Spiritual Grace’, Book 1, Ch. XIII]
3. “ Our Lord has promised me [says Sister Marie de Saint-Pierre] that He will imprint His Divine likeness on the souls of those who honor His most Holy Countenance. [January 21, 1847] “This adorable Face is, as it were, the seal of the Divinity, which has the virtue of reproducing the likeness of God in the souls that are applied to it.” [November 6, 1845]
4. “By My Holy Face you shall work miracles.” [October 27, 1845]
5. “By My Holy Face you will obtain the conversion of many sinners. Nothing that you ask in making this offer will be refused to. If you knew how pleasing the sight of My Face is to my Father.” [November 22,1846]
6. “As in an earthly kingdom you can procure all you wish with a coin marked with the princes effigy, so in the Kingdom of Heaven you may obtain all you desire with a precious coin of My Holy Humanity, which is My Adorable countenance. “ [October 29, 1845]
7. “All those who honor My Holy Face in a spirit of reparation will, by so doing, perform the office of the pious Veronica. “ [October 27, 1845]
8. “According to the care you take in making reparation to My Face disfigured by blasphemies, so will I take care of yours which has been disfigured by sin. I will reprint therein My image and render it as beautiful as it was on leaving the Baptismal font. “ [November 3, 1845]
9. “Our Lord has promised me, “says Sister Marie de Saint Pierre, “that all those who defend His cause in this work of reparation, by words, by prayers, or in writing, He will defend before His Father; at their death He will purify their souls by effacing all the blots of sin and will restore to them their primitive beauty.” [March 12, 1846]
From the book: The Revelations of the Holy Face of Jesus by John 
Reality Meets Faith 