Quran Universe
61:7

وَمَنۡ أَظۡلَمُ مِمَّنِ ٱفۡتَرَىٰ عَلَى ٱللَّهِ ٱلۡكَذِبَ وَهُوَ يُدۡعَىٰٓ إِلَى ٱلۡإِسۡلَٰمِۚ وَٱللَّهُ لَا يَهۡدِي ٱلۡقَوۡمَ ٱلظَّـٰلِمِينَ

Waman athlamu mimmani iftara AAala Allahi alkathiba wahuwa yudAAa ila alislami waAllahu la yahdee alqawma alththalimeena

And who is more unjust than one who invents about Allah untruth while he is being invited to Islam. And Allah does not guide the wrongdoing people.

Word by word
  1. وَمَنۡAnd who
  2. أَظۡلَمُ(is) more wrong
  3. مِمَّنِthan (one) who
  4. ٱفۡتَرَىٰinvents
  5. عَلَىupon
  6. ٱللَّهِAllah
  7. ٱلۡكَذِبَthe lie
  8. وَهُوَwhile he
  9. يُدۡعَىٰٓis invited
  10. إِلَىto
  11. ٱلۡإِسۡلَٰمِۚIslam
  12. وَٱللَّهُAnd Allah
  13. لَا(does) not
  14. يَهۡدِيguide
  15. ٱلۡقَوۡمَthe people
  16. ٱلظَّـٰلِمِينَ[the] wrongdoers
As-Saf · 61:7Madinah

Inventing lies about Allah while being called to Him.

The worst wrong is refusing the open door

Two directions
the invitationto worship Allah alone
answered with
a lie about Himrivals and partners
What makes it worse
they did not knowno one told them
they were being invitedthe door was open

Ibn Kathir explains that none is more unjust than one who lies about Allah and sets up partners with Him, even while he is being invited to worship Him sincerely. The weight comes from refusing while the call is still in your ears.

Someone kindly reminds you about the prayer you keep missing. You make up a reason: Allah does not need it, He knows my heart. That is putting words in Allah's mouth. The invitation is still open while you speak.

I can decide for myself what Allah really wants from me.

Making up what suits me about Allah, while He is calling me, is the deepest wrong.

Try this

Catch one phrase you use to excuse yourself, like "Allah knows my heart", and ask if it is really true.

Simplified reflection. Read the tafsir for scholarship.draft
Tafsir Ibn Kathir

And who does more wrong than the one who invents a lie against Allah, while he is being invited to Islam? And Allah guides not the people who are wrongdoers (7)They intend to put out the Light of Allah with their mouths. But Allah will bring His Light to perfection even though the disbelievers hate (it)(8)He it is Who has sent His Messenger with guidance and the religion of truth to make it victorious over all religions even though idolators hate (it)(9)

The Most Unjust among all People

Allah said,

وَمَنْ أَظْلَمُ مِمَّنِ افْتَرَىٰ عَلَى اللَّهِ الْكَذِبَ وَهُوَ يُدْعَىٰ إِلَى الْإِسْلَامِ ۚ 

(And who does more wrong than the one who invents a lie against Allah, while he is being invited to Islam?) meaning, none is more unjust than he who lies about Allah and calls upon rivals and associates partners with Him, even while he is being invited to Tawhid and sincerely worshipping Him. This is why Allah said,

وَاللَّهُ لَا يَهْدِي الْقَوْمَ الظَّالِمِينَ 

(And Allah guides not the people who are wrongdoers.) Allah said,

يُرِيدُونَ لِيُطْفِئُوا نُورَ اللَّهِ بِأَفْوَاهِهِمْ 

(They intend to put out the Light of Allah with their mouths.) indicating that the disbelievers will try to contradict the truth with falsehood. Their attempts are similar to one's attempt to extinguish the sun with his mouth, which is impossible. Likewise is the case of their attempt to extinguish truth. So Allah said,

وَاللَّهُ مُتِمُّ نُورِهِ وَلَوْ كَرِهَ الْكَافِرُونَ - هُوَ الَّذِي أَرْسَلَ رَسُولَهُ بِالْهُدَىٰ وَدِينِ الْحَقِّ لِيُظْهِرَهُ عَلَى الدِّينِ كُلِّهِ وَلَوْ كَرِهَ الْمُشْرِكُونَ

(But Allah will bring His Light to perfection even though the disbelievers hate (it). He it is Who has sent His Messenger with guidance and the religion of truth to make it victorious over all (other) religions even though the idolators hate (it).)

We explained the meanings of similar Ayat before, in the Tafsir of Surah Bara'ah. All praise and thanks are due to Allah.