´Clarification of this is in the Hadith of 'Umar bin Al-Khattab, from the Prophet(s.a.w) who said:` "The best of people are my generation, then those who follow them,then those who follow them. Then lying will spread, until a man testifies while his testimony was not requested, and a man will take an oath while an oath was not sought."
Hadith Referenceسنن ترمذي / كتاب الشهادات عن رسول الله صلى الله عليه وسلم / 2303