The disbelievers say, “If only a sign could be sent down to him from his Lord.”Say, ˹O Prophet,˺ “Indeed, Allah leaves to stray whoever He wills, and guides to Himself whoever turns to Him—those who believe and whose hearts find comfort in the remembrance of Allah.Surely in the remembrance of Allah do hearts find comfort.Those who believe and do good, for them will be bliss and an honourable destination.”Quran 13:27~29[ar-Ra`d (The Thunder)]
The word ar-Ra’d (thunder), which this Surah is named after, is used in the 13th Surah of the Qur’an, in the 13th Juzz and is the 13th Ayat.
This Surah has 43 Ayaat.
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وَیَقُولُ ٱلَّذِینَ كَفَرُوا۟ لَوۡلَاۤ أُنزِلَ عَلَیۡهِ ءَایَةࣱ مِّن رَّبِّهِۦۚ قُلۡ إِنَّ ٱللَّهَ یُضِلُّ مَن یَشَاۤءُ وَیَهۡدِیۤ إِلَیۡهِ مَنۡ أَنَابَ

ٱلَّذِینَ ءَامَنُوا۟ وَتَطۡمَىِٕنُّ قُلُوبُهُم بِذِكۡرِ ٱللَّهِۗ أَلَا بِذِكۡرِ ٱللَّهِ تَطۡمَىِٕنُّ ٱلۡقُلُوبُ

ٱلَّذِینَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّـٰلِحَـٰتِ طُوبَىٰ لَهُمۡ وَحُسۡنُ مَءَابࣲ
The basic theme of the Surah is divine guidance. Allah has created this whole universe. He knows what is in the wombs and every thing is under His knowledge. He sent His prophets and guides to all people for their guidance and now the Last Messenger has come.
اور کافر کہتے ہیں کہ اس (پیغمبر) پر اس کے پروردگار کی طرف سے کوئی نشانی کیوں نازل نہیں ہوئی۔ 
کہہ دو کہ خدا جسے چاہتا ہے گمراہ کرتا ہے 
اور جو (اس کی طرف) 
رجوع ہوتا ہے 
اس کو اپنی طرف کا 
رستہ دکھاتا ہے 

(یعنی) جو لوگ ایمان لاتے اور جن کے دل یادِ خدا سے آرام پاتے ہیں (ان کو) 
اور سن رکھو کہ خدا کی یاد سے دل آرام پاتے ہیں 

جو لوگ ایمان لائے اور عمل نیک کئے ان کے لیے خوشحالی اور عمدہ ٹھکانہ ہے
Allah’s signs in nature.
Allah knows everything; the whole universe praises Him. Those who have eyes can see the truth. The truth has an abiding power.
The faithful and unfaithful, their characters and their ends.
The comfort of the hearts is in the remembrance of Allah. Those who deny Allah, no signs or miracles can help them.
People in the past also denied Allah’s Prophets and laughed at them, but what were their ends.
Prophet Muhammad is the Messenger of Allah. The witness is Allah and all those who have the knowledge of the Scriptures of Allah.