So whoever does an atom's weight of good will see it,And whoever does an atom's weight of evil will see it.(Q.S. 99 : 7-8 )
Today I was touched ,reading a story from a famous Islamic scholar Imam Al Ghazzali(ra). "MasaAllah".... It's really related to Allah's promise in Quran , even the good deed , we've done only an atom's weight, Allah will consider it.
Allah SWT Had Decided for Imam Al-Ghazali (ra) as a great Wali and a great scholar and is a source of knowledge for the generations to come till The Last Day after letting the small fly drank the ink of his pen ,because it was very thirsty and he wait it until quenched its thirst. And another proof that Allah also will reward Jannah to those who are very kind to animal living as the follow hadits ;
Prophet Muhammad (saw) once told a story to his companions. There was a man who went on a journey and on his way felt very thirsty. He found a well and went down into it and drank water. When he came out of the well he saw a dog that was also very thirsty and was licking the salty ground with his tongue. Thinking that the animal was thirsty like him, he again went down into the well, filled his leather socks with water and gave it to the dog. Allah was so pleased with this action of the man that He granted him Paradise.