The Holy Quran 9:106 — Surah At-Tawbah
Arabic text
وَءَاخَرُونَ مُرْجَوْنَ لِأَمْرِ ٱللَّهِ إِمَّا يُعَذِّبُهُمْ وَإِمَّا يَتُوبُ عَلَيْهِمْ ۗ وَٱللَّهُ عَلِيمٌ حَكِيمٌ
Translation
There are some (sincere Sahaabah رضي الله تعالى عنهم who did not join Rasulullaah to Tabook despite their ability to do so) whose matter (whose forgiveness) has been postponed for (the arrival of) the order of Allaah. He will either punish them or accept their repentance. Allaah is All Knowing, The Wise. (This verse refers to three sincere Sahaabah رضي الله تعالى عنهم who did not present false excuses to Rasulullaah to justify their failure to join him to Tabook. They truly regretted this and sought Allaah's forgiveness. Their forgiveness was announced only fifty days later, during which period the other Muslims were commanded not to associate with them.)
Tafsir (excerpt) — Tafsir Usmani
The matter of the pardon of some of those who stayed behind from Tabuk: here another small group from among the people of Madinah is mentioned. The fact is that those who stayed behind from Tabuk (that is, those who did not take part in Tabuk) were of three kinds. First, the hypocrites, who kept away out of doubt and hypocrisy.
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