Mukhtasar Bukhari

Narrated by Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with them both) from the Noble Prophet (peace and blessings of Allah be upon him) that he said: "The best of people are those of my generation (i.e., the Companions, may Allah be pleased with them), then those who come after them (i.e., the Followers), then those who come after them (i.e., the Followers of the Followers). After them, there will come some people who will give testimony before being asked to swear an oath, and will swear an oath before being asked to give testimony."