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Shaykh al-Islam Ahmad al-Sirhindi (d. 1034/1624; Rahimahullah) who is regarded by many people in the Indian sub-continent as a great renovator of the Tenth Islamic Century (Mujaddid alf Thani) wrote in his Maktubat (Vol. 3, Letter 38):


"It was declared in a Hadith that this Ummah would part into 73 groups, 72 of which would go to Hell. This Hadith informs us that the 72 groups will be tormented in the Fire of Hell. It does not inform us that they will remain in torment eternally. Remaining in the torment of Hell Fire eternally is for those who do not have Iman. That is, it is for disbelievers. The 72 groups, on account of their corrupt beliefs, will go to Hell and will burn as much as the corruptness of their beliefs. One group, the 73rd, will be saved from Hell Fire because their belief is not corrupt. If among the members of this one group there are those who committed evil deeds and if these evil deeds of theirs have not been forgiven through repentance or intercession, it is possible that these, too, will burn in Hell as much as their sins. All of those who are in the 72 groups will go to Hell. But none of them will remain in Hell eternally. Not all of those who are in this one group will go to Hell. Of these only those who have committed evil deeds will go to Hell. The 72 reported groups of bid'ah, which will go to Hell, should not be called disbelievers, because they are Ahl al-Qibla (people of the Qibla in prayer). But, of these, the ones who disbelieve those facts in the Deen that are indispensably required to be believed, as well as those who deny the rules of the Shari'ah which every Muslim has heard and knows, become disbelievers."

In another letter (vol. 1, letter 80) he said:

"There is no doubt whatsoever that the sect that made conforming to the conduct of the Prophet's Companions (may Allah be pleased with them all) necessary, that alone is the Ahl as Sunnah wa'l Jama'ah."

http://www.masud.co.uk/ISLAM/misc/ahlsunna.htm