God says in the Quran:

“And proclaim the good news to those who believe and do good, so that they can be given gardens in whose lowlands there are streams …” (Quran 2:25)

God also says:

“Compete with each other for the forgiveness of your Lord and for paradise, the size of which is equal to the size of heaven and earth. (It is prepared for) those who believe in God and His Messenger … ”(Quran 57:21)
The Prophet Muhammad said that the lowest rank among the inhabitants of Paradise will be ten times his own on earth, [1] and he or she will receive whatever he or she desires, or ten times that. [2] The Prophet Muhammad also said: „A place in paradise the size of a foot would be better than the whole world and what is in it.“ [3] He also said: „In paradise there are things that no eye has seen yet, has not heard an ear and no human brain can imagine. ”[4] He also said:“ The most miserable man in this world of those who are for paradise will one day be immersed in paradise. Afterwards he will be asked: ‚Oh son of Adam, have you ever seen yourself in misery? Have you ever suffered any hardship? ‚ He will answer: ‚No, by God, oh Lord!

Whoever enters paradise will live happily, without illness, pain, grief or death; God will be happy with you and you will live forever. God says in the Quran:
„But those who believe and do good works, We want to enter gardens, flow through the streams, they will stay there forever …“ (Quran 4:57)

[1] Narrated at Sahih Muslim, # 186, and Sahih Al-Bukhary, # 6571.
[2] Narrated by Sahih Muslim, # 188, and Musnad Ahmad, # 10832.
[3] Narrated by Sahih Al-Bukhary, # 6568, and Musnad Ahmad, # 13368.
[4] Narrated by Sahih Muslim, # 2825, and Musnad Ahmad, # 8609.
[5] Narrated by Sahih Muslim, # 2807, and Musnad Ahmad, # 12699.


Source: https://www.islamland.com/deu/articles/das-tor-zum-ewigen-paradies