Umar ibn Al-Khattab reported: Some prisoners of war were brought in front of the Prophet, peace and blessings be upon him, and a woman was among them who was breast-feeding. Whenever she found a child among the prisoners, she would take it to her chest and nurse it. The Prophet said to us, “Do you think this woman could throw her child in the fire?” We said, “No, not if she is able to stop it.” The Prophet (peace and blessings be upon him) said, “Allah is more merciful to His servants than a mother is to her child.”
(Sahih Bukhari 5653)
We learn from this hadeeth that Allaah has put mercy into the hearts of our mothers and that a mother is naturally merciful to her child. If this is the mercy of the mother towards her child, then imagine the mercy of Allaah towards His Creation.