Those who are merciful will be shown mercy by the Most Merciful. Be merciful to those on the earth and the One in the heavens will have mercy upon you.

Abdullah ibn Amr - Sunan Abu Dawud & Tirmidhi

He who does not show mercy will not be shown mercy.

Jarir ibn Abdullah - Sahih Bukhari & Muslim

In every living being there is a reward.

Abu Hurairah - Sahih Bukhari & Muslim