You are reading a tafsir for the group of verses 19:78 to 19:79
اطلع الغيب ام اتخذ عند الرحمان عهدا ٧٨ كلا سنكتب ما يقول ونمد له من العذاب مدا ٧٩
أَطَّلَعَ ٱلْغَيْبَ أَمِ ٱتَّخَذَ عِندَ ٱلرَّحْمَـٰنِ عَهْدًۭا ٧٨ كَلَّا ۚ سَنَكْتُبُ مَا يَقُولُ وَنَمُدُّ لَهُۥ مِنَ ٱلْعَذَابِ مَدًّۭا ٧٩
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3

This verse is an answer to ` As Ibn Wa’ ils boastful claim. How does he know that when he is brought back to life he will still have his wealth and children?

أَطَّلَعَ الْغَيْبَ (Has he peeped in the unseen - 19:78) It is obvious that nothing of this kind has happened. Then why has he considered it as a surety?

أَمِ اتَّخَذَ عِندَ الرَّ‌حْمَـٰنِ عَهْدًا

“ Or taken a covenant with The Rahman (All-Mercifull)”

Or has he entered into a covenant with Allah Ta` ala and obtained a promise from Him for his wealth and his children?