Allah ﷻ
“Say: O my servants who have acted extravagantly against their own souls, do not despair of the mercy of Allah; surely Allah forgives the faults altogether; surely He is the Forgiving the Merciful” (Quran, 39:53).
Allah’s name “Al-Ghaffar,” meaning “The Ever Forgiving,” is related to His Mercy. If one is sincere in asking for forgiveness from Allah, there is no sin that it too great for Him to forgive. When asking for forgiveness, a person would ask directly of God and there is no intermediary or religious cleric that would intervene. Islam has the principle that one should have a direct relationship with God and one should learn to have dependence, faith and trust in Him for all their affairs. (Learn more: Concept of God in Islam)
People will enter Paradise by the Mercy of God. The Prophet Muhammadﷺ is reported to have said that no man’s good deeds alone are enough to get him admitted into Paradise, but it is only by the Mercy of God that people will enter Paradise. Our deeds are a tool to get close to God. (Read more: Life After Death)
Some other Names of Allah that are related to His Mercy (with rough translations) are Al-Karim (the Generous), Al-Halim (the Forbearing), Al-Barr (the Generous), Al-Jawwad (the Bestower of Good), Ar-Rauf (the Kind) and Al-Wahhab (the Bestower).