Hadith implies that the heaven has eight doors: Whoever performed a perfect ablution and recited shahadah then all the eight doors of the heaven are thrust open for him–he may enter from whichever door he likes. (Sahih Muslim).
The Prophet of Allah (SAW) has also told us:
When Ramadhan comes round, the doors of the skies are opened. Another tradition has it that the doors of the Heaven are opened and those of the Fire are closed (Sahih Bukhari).
The Prophet of Allah (SAW) said:
By Him in whose hands my soul is, the distance between the two gate posts of paradise is like the distance between Makkah and Himyar or between Makkah and Basra (Bukhari).
Indeed swords are the keys of heaven. (Ibn Abi Sheeba, Kitabul Jihad)
Be you foremost (in seeking) forgiveness from your Lord, and a garden of Bliss the width of whereof is as the width of heaven and earth. (Al-Hadid: 21)
The Prophet of Allah (SAW) has described the width of heaven thus: Harith’s (RA) mother came to the Prophet (SAW), Harith had been martyred during the battle of Badr. She said: "O Prophet of Allah! You know how much I loved him. If his reward is heaven, than I will not cry but if not than you see what I will do before you." The Prophet of Allah (SAW) said: "Is that just one heaven? There are very many heavens and your son is in the best of them, Al-Firdous Al-Aala." (Sahih Bukhari)
The Prophet of Allah (SAW) said:
Indeed, there are hundred grades of the Heaven and the distance between the two grades is as great as between the heaven and earth. Allah has prepared these grades for those who perform Jihad in the way of Allah. (Bukhari)
The Prophet of Allah (SAW) said of Firdous:
When you pray ask for Firdous, for it is in the middle of heaven and is higher in grade than the heaven and above Firdous is Allah’s throne, moreover the canals of heaven flow from Firdous. (Bukhari)
The Prophet of Allah (SAW) said:
"And then I was showed in the heaven, I saw there were camps made of pearls and the soil was of musk." (Bukhari)
The Qur’an says of the dwellers of the heaven: They will see there neither the sun’s (excessive heat) nor the moon’s excessive cold.
The Prophet of Allah (SAW) said:
Indeed, there is a tree in heaven so big that if a person keeps riding on a brisk Madhamar (a specially bred horse) for a hundred years even then he would not reach the end of that tree. (Bukhari)
Abu Huraira (RA) reported that the Prophet of Allah (SAW) said:
There is no tree in the heaven that does not have a trunk of gold. (Muslim)
There is a tree in the heaven, which will manufacture robes for the dwellers of the heaven. That tree is called Tuba.
A hadith has these words about this tree.
Tuba is a tree in the heaven, which spreads out as much as a distance that can be covered in a hundred years. Robes for the dwellers of the heaven will sprout from its buds.
The Prophet of Allah (SAW) said:
In the night of Isra when I met Ibrahim (AS) he said: O Muhammad (SAW) tell your people that the heaven has pure soil and sweet water but the land is bare. If they want to plant trees in the heaven, they should say Subhan Allah Al-Hamdulillah and Allah Akbar.
Jannat–This name has been used most commonly in the Qur’an and Hadith. (Al-Baqarah: 35, Al-e-Imran: 133, 142, Al-Maidah: 72)
Dar-us-Salam–This means the Home of Peace (Yunus: 25)
Jannat-ul-Khuld–The Eternal Gardens. (Al-Furqan: 15)
Darul-Maqamah–The Home (Fatir: 35)
Jannat-e-Adan–Gardens of Everlasting Bliss (Tauba: 72, Ar-Rad: 23)
Darul-Hywan–But verily the Home in the Hereafter–that is life indeed, if they but knew. (Al-Ankabut: 64)
Jannat-un-Naeem–The Gardens of Delight. (Al-Maida: 65 Yunus: 9 Al-Haj: 56)
Al-Maqam-al-Ameen–The House of Security (Ad-Dukhan: 51)
Jannat-ul-Mawa–Garden of Abode (An-Najm: 15)
Maqad-as-Sidq–Assembly of Truth (Al-Qawr: 55)
Qadam-as-Sidq-Assembly ofTruth (Al-Qawr:55).
Firdous–The Highest Gardens of the Heaven (Al-Kahaf: 107, Al-Muminoon: 11)
According to Ahadith, the scent of the Heaven can be smelled from a distance of 70 years. (Sahih Al-Jame As-sagheer)
The Prophet of Allah (SAW) said:
Indeed, there will be a mansion made of pearls for a believer. It will be spread over an area of 60 miles, and in it will be the household of a believer who will visit them but they will not be able to see each other. (Bukhari)
The Prophet of Allah (SAW) said:
Sleep is the sisiter of death and the dwellers of the heaven will not sleep (Silsalatul Ahadith)
It is reported on the authority of Anas bin Malik (RA): The Prophet of Allah (SAW) said:
Indeed, there is a bazaar in the heaven where the dwellers of the Heaven will come on every Friday. The northerly wind will spray scent on them and this will enhance their beauty. And when they will return to their homes, their households will say "By Allah, your beauty has enhanced." "So has yours," they will return the compliment. (Muslim)
In short, they will be overwhelmed by Allah’s favours.
And when you look, it is there you will see a bliss and a realm magnificent. (Ad-Dahr: 20)
The Prophet of Allah (SAW) said:
When Allah Almighty created the heaven and the hell, He asked Jibraeel to go and take a look at what He has prepared for believers in the Heaven. Jibraeel went and had a look at what was there in the Heaven, and then he came back and expressed himself thus: By your dignity! Whoever will hear of this Heaven will certainly strive for it. Then it was said that the road to the heaven is littered with hardships, and Jibraeel was asked to take another look at the Heaven. He came back and said, "By your dignity I am afraid that nobody will be able to enter it. (Tirmizee)
This means that the heaven is such a magnificent place that whoever knew of it would certainly strive for it, but when Allah Almighty ordained that the Heaven lies in facing trials and tribulations, Gibraeel (AS) thought that nobody might be able to enter it.
Information from Voice of Islam - June 1999