The story of Ashab Al-Jannah ( Garden Owners) took place historically

Surah Al-Qalam starts with the letter

Idgham means

فَطَافَ عَلَيْهَا طَآئِفٌۭ مِّن رَّبِّكَ وَهُمْ نَآئِمُونَ The undelined word means

أَنِ ٱغْدُوا۟ عَلَىٰ حَرْثِكُمْ إِن كُنتُمْ صَـٰرِمِينَ ٢٢ The underlined word means

كَذَٰلِكَ ٱلْعَذَابُ ۖ وَلَعَذَابُ ٱلْـَٔاخِرَةِ أَكْبَرُ ۚ لَوْ كَانُوا۟ يَعْلَمُونَ the first stop sign in this Aya

قَالَ أَوْسَطُهُمْ أَلَمْ أَقُل لَّكُمْ لَوْلَا تُسَبِّحُونَ ٢٨ The tajweed rule for the underlined

Idgham Mutamathil must be the same letter that comes after each other in 1 word

Halqi (Throat letters) are the letters of Izhar