Can a human being be a Rabbani slave if he swears by Allah and fulfills his oath, and how can one be a Rabbani slave?

The word "Rabbani" (رباني) appears three times in the Holy Quran, in Surat Al Imran and Al-Ma'idah. Ibn Abbas and others have mentioned several meanings for it, including: the wise, the knowledgeable, the forbearing, and the jurists.

In Sahih Al-Bukhari, "Rabbani" is defined as: "He who nurtures people with the small matters of knowledge before the great ones."

The Rabbani is the knowledgeable, practicing, teaching scholar who adheres to the religion of Allah and His obedience, and is insightful in the governance of people.

A servant becomes "Rabbani" when characterized by these attributes of knowledge, forbearance, wisdom, asceticism, worship, and teaching people good. The way to achieve this is by strengthening faith in Allah Almighty and perfecting belief in His promise and His warning.