What is the opinion of scholars on emigration (Hijra) and excommunication (Takfir)?

The group "Takfir wal-Hijra" emerged in Egypt in 1971, led by Shukri Mustafa, who was executed in 1978. The group's principles are based on:

1. Declaring someone who commits a grave sin to be an infidel (takfir of the perpetrator of a major sin). 2. Disparaging the Companions (Sahaba). 3. The rule of "the minimum level of Islam," which dictates declaring as infidel anyone who does not perform all obligatory duties. 4. The rule of "clarification" (al-tabayyun), which means declaring as infidel anyone who does not join their group. 5. The rule of "conflict of obligations" (ta'arud al-fara'id), which permitted them to abandon some obligations, such as Friday prayer. 6. Separating from and abandoning society, considering it ignorant and infidel, and prohibiting marriage to its members.

In addition, they reject scholarly consensus (ijma') and tradition (taqlid (definition)), declare those who follow tradition to be infidels, and discard the opinions of the Companions.