أعوذ بالله من الشيطان الرجيم

بِسْمِ ٱللَّٰهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ

As Salaamu Alaikum Wa Rahmatullahi Wa Barakatuh,

Based on your specific question and information provided.

From the Jurisprudence Perspective: 

A mujtahid or the most learned can be identified in one of three ways:

1. a duty-bound person (mukallaf)(2) is certain himself [that someone is a mujtahid or the most learned]. For example, the person is a scholar himself and is able to identify a mujtahid and the most learned;

2. two learned and dutiful people who are able to distinguish a mujtahid and the most learned confirm that someone is a mujtahid or the most learned, provided that two other learned and dutiful people do not disagree with their statement. In fact, being a mujtahid or the most learned is also established by even one expert (ahl al‑khibrah) whom one trusts;

3. a mukallaf attains confidence (iṭmiʾnān) that a person is a mujtahid or the most learned by rational means. For example, a group of scholars who are able to distinguish a mujtahid and the most learned and from whose statements one gains confidence, confirm that someone is a mujtahid or the most learned.

والله العالم‎
(and Allah(awj) Knows best)

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