It is narrated from Sayyiduna Umar (may Allah be pleased with him), he said: Whoever does not show mercy will not be shown mercy himself, and whoever does not forgive will not be forgiven, and he who does not consider repentance important is not given attention, and he who does not try to avoid sin is not protected from it.

It is narrated from Sayyiduna Qarra bin Iyas (may Allah be pleased with him), he said: A man submitted, "O Messenger of Allah! Indeed, when I slaughter a goat, I feel compassion for it," or he said, "I feel pity while slaughtering a goat." The Prophet (peace and blessings of Allah be upon him) said: "If you show mercy to the goat, Allah will show mercy to you." The Prophet (peace and blessings of Allah be upon him) said this twice.

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that I heard the truthful and trusted Prophet, Abu al-Qasim (peace and blessings of Allah be upon him), saying: "Mercy is only removed from the heart of the wretched."

It is narrated from Sayyiduna Jarir (may Allah be pleased with him), who reports from the Prophet (peace and blessings of Allah be upon him), that he said: "Whoever does not show mercy to people, Allah Almighty does not show mercy to him."

It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) was the most merciful of all people towards his family. And the Prophet (peace and blessings of Allah be upon him) had a son (Ibrahim) who was being breastfed in an area near Madinah. His foster father was a blacksmith, and we used to go to him, while he had warmed and perfumed the house with the smoke of idhkhir grass. The Prophet (peace and blessings of Allah be upon him) would kiss him and smell him.

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that a man came to the Prophet (peace and blessings be upon him) and he had a child with him. He began to lovingly embrace the child to his chest. The Prophet (peace and blessings be upon him) said:“Do you show mercy and affection to him?”He replied: Yes. The Prophet (peace and blessings be upon him) said:“Allah is even more merciful to you than you are to this (child). He is the Most Merciful of all those who show mercy.”

Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "A man was walking on a road when he became extremely thirsty. He found a well, so he went down into it and drank water. When he came out, he saw a dog panting and eating moist earth out of thirst. The man thought, 'This dog is suffering from thirst just as I was.' So he went down into the well, filled his sock with water, held it in his mouth, and climbed out, then gave the dog water to drink. Allah appreciated his action and forgave him." The Companions asked, "O Messenger of Allah! Is there a reward for us in (serving) animals as well?" He (peace and blessings be upon him) said: "There is a reward for serving every living being with a moist liver."

It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "A woman was punished because of a cat. She had tied it up until it died of hunger, so that woman entered the Fire because of it. Allah knows best. It is said regarding her: When you tied it up, you neither fed it nor gave it water to drink, nor did you let it go so that it could eat the insects of the earth and save its life."

It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them both) that the Prophet (peace and blessings of Allah be upon him) said: "Show mercy, you will be shown mercy; forgive people, Allah Almighty will forgive you. Woe to those who listen with one ear and let it out the other, woe to those who persist—those who knowingly persist in their sins."

It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever shows mercy, even to a slaughtered animal, Allah Almighty will show mercy to him on the Day of Resurrection."