Abu Huraira reported: The Messenger of Allah, peace be upon him, said, “Verily, my fountain is wider than the distance between Ayla and Eden. Its water is whiter than ice and sweeter than honey and milk. Its cups are more numerous than the stars. Verily, I will prevent some people from it just as a man prevents camels from his fountain.” They said, “O Messenger of Allah, will you recognize us on that Day?” He said, “Yes, you will have marks which nobody among the people will have but you. You will come to me with a blazing forehead and bright hands and feet because of the traces of ablution.”
Simple Islamic teaching that most of the people these days forget to apply: Saying "Thank you" or "Jazak Allah Khair ". If someone helps you with something just say this simple sentence with a smile on your face wallahi it creates an atmosphere of peace and friendliness more than you can imagine.
“Whoever does not give thanks to the people does not give thanks to Allaah” (a saheeh hadeeth narrated by Imaam Ahmad, 2/258).