لِيَكْفُرُوا۟ بِمَآ ءَاتَيْنَـٰهُمْ ۚ فَتَمَتَّعُوا۟ فَسَوْفَ تَعْلَمُونَ

EnglishSaheeh International: So that they will deny what We have granted them. Then enjoy yourselves, for you are going to know.
TamilJan Trust Foundation: நாம் அவர்களுக்கு அருளியதற்காக (நன்றி செலுத்தாமல்) அவர்களை நிராகரித்துக் கொண்டிருக்கட்டும்; நீங்கள் சுகமனுபவித்துக் கொண்டிருங்கள்; விரைவில் (இதன் விளைவை) நீங்கள் அறிந்து கொள்வீர்கள்.
SinhalaRuwwad Center: (එසේ සිදු කරනුයේ) ඔවුනට අපි පිරිනැමූ දෑ සම්බන්ධයෙන් ඔවුන් ගුණමකු වනු පිණිස ය. එහෙයින් නුඹලා භුක්ති විඳිනු. එවිට නුඹලා මතු දැන ගනු ඇත.
UrduMaulana Muhammad Junagarhi: تاکہ وه اس چیز کی ناشکری کریں جو ہم نے انہیں دی ہے اچھا تم فائده اٹھا لو! ابھی ابھی تمہیں معلوم ہو جائے گا.
JapaneseRyoichi Mita: われが与えたものを有り難く思わないようになる。（僅かの年月を）享楽するがいい。だがやがて分るであろう。
ChineseMa Jian: 以至孤负他的赐他们的恩典。你们享受吧，你们将来就知道了。

Tafsir of 30:34

How man sways between Tawhid and Shirk, and between Joy and Despair, according to His Circumstances Allah tells us that when man is in dire straits, he calls upon Allah alone with no partner or associate, then when times of ease come and they have the choice, some people associate others with Allah and worship others alongside Him. لِيَكْفُرُواْ بِمَآ ءاتَيْنَهُمْ (So as to be ungrateful for the graces which We have bestowed on them.) Then Allah warns them by saying: فَسَوْفَ تَعْلَمُونَ (but you will come to know.) One of them said: By Allah, if a law enforcment officer were to say this to me, I would be afraid, so how about when the One Who is issuing the warning is the One Who merely says to a thing "Be!" and it is Then Allah denounces the idolators for fabricating lies and worshipping others instead of Him with no evidence or proof: أَمْ أَنزَلْنَا عَلَيْهِمْ سُلْطَناً (Or have We revealed to them an authority,) means, proof. فَهُوَ يَتَكَلَّمُ (which speaks) means, tells بِمَا كَانُواْ بِهِ يُشْرِكُونَ (of that which they have been associating with Him) This is a rhetorical question intended to denounce them, for they have no such thing.…

Source: Ibn Kathir (Abridged)