Describing the saved sect, the Messenger of Allaah said, they are
(A) “What I and my companions are upon.” [At-Tirmidhee 2792]
(B) “The Jamaa’ah.”
(C) “As-Suwaad Al-A’dham (the main body).”
‘The main body’ here does not refer to the great majority of people in every age and era, rather this is specific for the era of the Companions and the Taabi’een (those whom the Messenger of Allaah praised).
And furthermore, that person is from the Jamaa’ah who agrees and conforms to the truth, even if he is alone:
Ibn Mas’ood (d. 32H) said:
“The jamaa’ah is whatever agrees with the truth – even if you are alone.” [Reported in Taareekh Dimashq with an authentic chain of narration]
Ishaaq Ibn Raahawaih (d. 238H), the teacher of Imaam Bukhaaree, said:
“If you were to ask the ignorant people about the ‘Main Body’ they would say, ‘The majority of people.’ They do not know that the jamaa’ah is the scholar who clings to the narrations from the Prophet (saw) and his way. So whoever is with the him (the scholar) and follows him, then he is the Jama’ah.” [Aboo Nu’aym in Hilyatul Awliyaah]