Who will enter Janna and who will enter Jahanam?

The choice is ours:

People will be in three categories :

1. Those forerunner /foremost (The greatest believers: Prophets, scholars, martyrs etc..)
2. Those on the right (Those who succeeded in their belief and good actions)
3. The right hand, those wrong doers who will enter Jahanam

The following verses explaining it all

Chapter 56 Al Waqiah 

7. You will be sorted into three categories.

8. Those on the Right—what of those on the Right?

9. And those on the Left—what of those on the Left?

10. And the forerunners, the foremost.

11. Those drawn near.

12. In the Gardens of Delight.

13. A multitude from the earliest generations.

14. And a few from the later ones.

15. Upon ornate thrones.

16. Facing each other.

17. Eternalized youths will circulate among them.

18. With pitchers and cups filled with a crystal-clear drink.

19. Which neither induces headaches nor intoxication.

20. And fruits of whatever they choose.

21. And the meat of birds that they crave.

22. And beautiful companions.

23. Resembling pristine pearls.

24. As a recompense for what they used to do.

25. There, they will hear no idle or sinful speech.

26. Only the words: “Peace, Peace.”

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27. And those on the Right—what of those on the Right?

28. Amidst lush gardens.

29. And blooming, fragrant flowers.

30. Under vast, plentiful shades.

31. With abundant poured out water.

32. And an abundance of fruit.

33. Unending and unrestricted.

34. And elevated mattresses.

35. We created them uniquely.

36. And made them virginal and pure.

37. Loving and of equal age.

38. For those on the Right.

39. A multitude from the earliest generations.

40. And a multitude from the later ones.

41. And those on the Left—what of those on the Left?

42. In scorching winds and scalding water.

43. Under the shadow of dense, black smoke.

44. Neither cool nor refreshing.

45. They were indulged in luxury before that.

46. And they persisted in immense wrongdoing.

47. And they used to say, “After we die and become dust and bones, will we be resurrected?

48. And our ancestors as well?”

49. Say, “Certainly, the earlier and later generations.

50. Will be gathered together for the scheduled meeting of a known day.”

51. Then you, O misguided deniers.

52. Will eat from the Tree of Bitterness.

53. You will fill your bellies with it.

54. Then, on top of it, you will drink boiling fluids.

55. Drinking as parched camels do.

56. This is their hospitality on the Day of Reckoning.