Allah Says in the Holy Quran:

Say, “O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allah . Indeed, Allah forgives all sins. Indeed, it is He who is the Forgiving, the Merciful.” – (Surah Az-Zumar 39:53)

Umar Ibn al-Khattab (radhi allahu anhu) relates that some prisoners were brought before Allah’s Messenger (sallallahu alaihi wa-sallam) and amongst them was a woman who was frantically searching for someone in the crowd. When she found a baby amongst the prisoners, she took it in her arms, cradled it next to her chest and suckled it. So Allah’s Messenger (sallallahu alaihi wa-sallam) said: “Do you think that this woman would ever throw her child into the fire?” We said: ‘By Allah, Never!’ So he said: “Allah is more merciful to His believing servants than that mother could ever be to her child.” [Saheeh al-Bukharee (10/426) and Saheeh Muslim (18/80)]