Which group will enter the paradise according to Qur'an and Hadith?

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

A faction whose members follow the Holy Quran and the Prophetic Sunnah, in word and in deed, wholly and in detail, as believed and practiced by the Companions and righteous predecessors, will be the successful one, and the one to enter Paradise.

‘Abdullah Ibn ‘Amr narrated that the Prophet said: “What befell the children of Israel will befall my Ummah, step by step, such that if there was one who had intercourse with his mother in the open, then there would be someone from my Ummah who would do that. Indeed the children of Israel split into seventy-two sects, and my Ummah will split into seventy-three sects. All of them are in Hellfire except one sect.” They (Companions) asked: “And which one is it O Messenger of Allah?” He said: “What I am upon and my Companions.” [At-Tirmithi]
For more benefit on the saved sect (Ahlus-Sunnah wal-Jamaa’ah), please refer to Fataawa 2496, 22613, 33503, 351652, 25101 and 22612.
Allah knows best.