Indeed, the true scholars (‘Ulamā’-e-Ḥaqq’) are the heirs and successors of the Prophets (peace be upon them). (Hadith)

However, this inheritance and succession can only be true and complete if the purpose of their lives and the focus of their efforts are the same as those of the Prophets.

And what was that purpose and focus?

In two words: “Pure Religion”, and in one word: “Tawḥīd” — Oneness of God.

That is:
To worship Allah alone, with absolute sincerity,
and to submit to Him with full obedience —
a right that belongs to Him alone —
to implement this first within oneself,
and then to strive for its establishment in others.

“Beware! The pure religion belongs to Allah alone.” (Surah Az-Zumar 39:3)
“Until the religion belongs solely to Allah.” (Surah Al-Baqarah 2:193)
“And We did not send any messenger before you except that We revealed to him: ‘There is no deity but Me — so worship Me alone.’” (Surah Al-Anbiya 21:25)
“He it is who sent His Messenger with guidance and the true religion, to make it prevail over all other ways of life — even though the polytheists may detest it.” (Surah As-Saff 61:9)