Between 1930 and 1938 Jesus appeared to Sister Faustina (now,Saint Faustina), a Sister of Mercy in Poland who initiated the Divine Mercy devotion.
The feast of Mercy is celebrated on the Second Sunday / Octave Sunday Easter.Jesus also asked that a picture be painted according to the Vision of Himself as the Fountain of Mercy.
He gave Saint Faustina a chaplet to be recited and said that it was appropriate to pay the chaplet at three o'clock each afternoon (the Hour of Great Mercy).
CHAPLET OF DIVINE MERCY
1. Begin with the Sign of the Cross. Recite the Our Father, Hail Mary and the Apostles' Creed.
2. OUR FATHER BEADS: Eternal Father, I offer You the Body and Blood, Soul and Divinity of our sins and those of the whole world.
3. 10 HAIL MARY BEADS: For the sake of His Sorrowful Passion, have mercy on us and the whole world.
( Repeat step 2 and 3 for all the five decades.)
4. Conclude with (Three Times): Holy God, Holy Mighty One, Holy Immortal One,have mercy on us, and the whole world.
5. Closing Prayer (Optional): Eternal God, in Whom mercy is endless and the treasury of compassion-- inexhaustible, look kindly upon us and increase Your mercy in us, that in difficult moments we might we might not despair nor become despondent, but with great confidence submit ourselves to your will, which is Love and Mercy itself.