جَنَّـٰتِ عَدْنٍ ٱلَّتِى وَعَدَ ٱلرَّحْمَـٰنُ عِبَادَهُۥ بِٱلْغَيْبِ ۚ إِنَّهُۥ كَانَ وَعْدُهُۥ مَأْتِيًّا

EnglishSaheeh International: [Therein are] gardens of perpetual residence which the Most Merciful has promised His servants in the unseen. Indeed, His promise has ever been eminent.
TamilJan Trust Foundation: அத்னு என்னும் அந்தச் சுவனபதிகளை அர்ரஹ்மான் தன் நல்லடியார்களுக்கு - அவற்றை அவர்கள் காண முடியாத போதே - வாக்களித்தான்; நிச்சயமாக அவனுடைய வாக்குறுதி நிறைவேறும்.
SinhalaRuwwad Center: (ඒවා) මහා කරුණාන්විතයාණන් තම ගැත්තන්හට පොරොන්දු වූ අදෘශ්‍යමාන සදාතනික (ස්වර්ග) උයන් ය. නියත වශයෙන් ම ඔහුගේ පොරොන්දුව ගෙන එනු ලබන්නකි.
UrduMaulana Muhammad Junagarhi: ہمیشگی والی جنتوں میں جن کا غائبانہ وعده اللہ مہربان نے اپنے بندوں سے کیا ہے۔ بیشک اس کا وعده پورا ہونے واﻻ ہی ہے.
JapaneseRyoichi Mita: アドン（エデン）の楽園，それは信じていても目には見えないものだが，慈悲深い御方がそのしもべたちに約束なされたものである。本当にかれの約束は，いつも完遂される。
ChineseMa Jian: 那是常住的乐园，至仁主在幽玄中应许其众仆的，他的诺言确是要履行的。

Tafsir of 19:61

The Description of the Gardens of the Truthful and Those Who repent Allah, the Exalted, says that the Gardens (of Paradise), which the penitent will enter, will be Gardens of `Adn, meaning, eternity. These are Gardens that the Most Beneficent promises His servants in the unseen. This means that these Gardens are from the unseen things that they believe in, even though they have never witnessed them. They believe in the unseen out of their strong conviction and the strength of their faith. Concerning Allah's statement, إِنَّهُ كَانَ وَعْدُهُ مَأْتِيّاً (Verily, His promise must come to pass.) This affirms the fact that this will occur, and that it is a settled matter. Allah does not break His promise, nor does He change it. This is similar to His statement, كَانَ وَعْدُهُ مَفْعُولاً (His promise is certainly to be accomplished.) 73:18 This means that His promise will be and there is no avoiding it. Allah's statement here, مَأْتِيّاً (must come to pass.) This means that it will come to His servants who are striving towards it and they will reach it.…

Source: Ibn Kathir (Abridged)