عن جرير بن عبد الله -رضي الله عنه- مرفوعاً: «مَنْ لا يَرْحَمِ النَّاسَ لا يَرْحَمْهُ اللهُ».
[صحيح.] - [متفق عليه.]
المزيــد ...

Jarīr ibn ‘Abdullāh (may Allah be pleased with him) reported that the Messenger (may Allah's peace and blessings be upon him) said: "He who does not show mercy to people, Allah will not show mercy to him."
[Sahih/Authentic] - [Al-Bukhari and Muslim]

Explanation

He who does show mercy to people, Allah, Exalted and Glorified, will not show mercy to him. The word 'people' refers to those who deserve mercy, such as Muslims, non-Muslims under Muslims' protection, and the like. As for combatant non-Muslims, they aren't to be shown mercy. They should be killed. Allah described the Messenger and his companions in the Qur'an: {severe against disbelievers, but merciful among themselves.} [Sūrat al-Fat'h: 29]

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1: People are specifically mentioned out of particular care about them. Yet, mercy is required for all creatures.
2: Mercy is a great trait that Islam is keen on boosting in the human soul.
3: Mutual mercy among people causes Allah Almighty to show mercy to them.
4: It establishes the existence of Allah’s mercy, which is a real attribute of His. It is to be understood in its apparent sense and in a way that befits His majesty.