Tabi'un

The tābiʿūn (, also accusative or genitive tābiʿīn , singular ''tābiʿ'' ), "followers" or "successors", are the generation of Muslims who followed the companions (''ṣaḥāba'') of the Islamic prophet Muhammad, and thus received their teachings secondhand. A ''tābiʿ'' knew at least one ''ṣaḥābī''. As such, they played an important part in the development of Islamic thought and knowledge, and in the political development of the early caliphate.

The next generation of Muslims after the ''tabiʿūn'' are called the ''tābiʿ at-tābiʿīn'' . The first three generations of Muhammad's followers make up the ''salaf'' of Islam. Provided by Wikipedia