The scholars have indicated the importance of this
Hadith. Ash-Shafi (may Allah have mercy on him) said:
This Hadeeth is a third of knowledge, and it is related to
seventy chapters of jurisprudence. Imam Ahmad (may
Allah have mercy on him), said: The fundamentals of Islam
revolve around three Hadith: This Hadith of Omar, the
Hadith of Aishah (may Allah be pleased with her) which
states: Whoever introduces something into our religion
which is not a part of it, then it is rejected, and the
Hadeeth of An-Numan (may Allah be pleased with him),
which states: The lawful is clear, and the unlawful is
clear.
