It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The first people of this Ummah are its best, and its last people will be its worst, differing and divided. So whoever believes in Allah and the Last Day, let his death come to him while he is treating people the way he would love to be treated."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10471