Sayyiduna Imran bin Husayn (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "The best of you is my generation, then those who come after them, then those who come after them." Sayyiduna Imran (may Allah be pleased with him) said: I do not remember whether the Messenger of Allah (peace and blessings be upon him) mentioned two generations after his own generation or three. "Then after them there will be people who will give testimony though their testimony is not sought, who will betray though they are not entrusted with anything, who will make promises but not fulfil them, and obesity will appear among them."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15672