You are reading a tafsir for the group of verses 51:10 to 51:16
قتل الخراصون ١٠ الذين هم في غمرة ساهون ١١ يسالون ايان يوم الدين ١٢ يوم هم على النار يفتنون ١٣ ذوقوا فتنتكم هاذا الذي كنتم به تستعجلون ١٤ ان المتقين في جنات وعيون ١٥ اخذين ما اتاهم ربهم انهم كانوا قبل ذالك محسنين ١٦
قُتِلَ ٱلْخَرَّٰصُونَ ١٠ ٱلَّذِينَ هُمْ فِى غَمْرَةٍۢ سَاهُونَ ١١ يَسْـَٔلُونَ أَيَّانَ يَوْمُ ٱلدِّينِ ١٢ يَوْمَ هُمْ عَلَى ٱلنَّارِ يُفْتَنُونَ ١٣ ذُوقُوا۟ فِتْنَتَكُمْ هَـٰذَا ٱلَّذِى كُنتُم بِهِۦ تَسْتَعْجِلُونَ ١٤ إِنَّ ٱلْمُتَّقِينَ فِى جَنَّـٰتٍۢ وَعُيُونٍ ١٥ ءَاخِذِينَ مَآ ءَاتَىٰهُمْ رَبُّهُمْ ۚ إِنَّهُمْ كَانُوا۟ قَبْلَ ذَٰلِكَ مُحْسِنِينَ ١٦
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3

قُتِلَ الْخَرَّ‌اصُونَ (Death upon those who make conjectures - 51:10). The expression kharrasun is the plural of kharras which means one who estimates or say things by conjecture. In this context the word refers to those stubborn and obstinate infidels who, without any reason or evidence, say discordant things about the Messenger ﷺ . Thus it would not be out of turn to interpret kharrasun as kadhdhabun, meaning 'the great liars' as they are condemned, denounced, cursed and imprecated (Mazhari) in this statement. After the mention of infidels, several verses that follow describe the qualities of the righteous people and the pleasant consequences of their righteousness.