The Quran root ل ي س l-y-s

وَقَالَتِ الْيَهُودُ لَيْسَتِ النَّصَارَىٰ عَلَىٰ شَيْءٍ وَقَالَتِ النَّصَارَىٰ لَيْسَتِ الْيَهُودُ عَلَىٰ شَيْءٍ وَهُمْ يَتْلُونَ الْكِتَابَ كَذَٰلِكَ قَالَ الَّذِينَ لَا يَعْلَمُونَ مِثْلَ قَوْلِهِمْ فَاللَّهُ يَحْكُمُ بَيْنَهُمْ يَوْمَ الْقِيَامَةِ فِيمَا كَانُوا فِيهِ يَخْتَلِفُونَ ١١٣

لَيْسَتِ laysati · Not

The Jews say, "The Christians have nothing [true] to stand on," and the Christians say, "The Jews have nothing to stand on," although they [both] recite the Scripture. Thus do those who know not [i.e., the polytheists] speak the same as their words. But Allāh will judge between them on the Day of Resurrection concerning that over which they used to differ. (Surah Al-Baqarah, 2:113)

لَّيْسَ الْبِرَّ أَن تُوَلُّوا وُجُوهَكُمْ قِبَلَ الْمَشْرِقِ وَالْمَغْرِبِ وَلَٰكِنَّ الْبِرَّ مَنْ آمَنَ بِاللَّهِ وَالْيَوْمِ الْآخِرِ وَالْمَلَائِكَةِ وَالْكِتَابِ وَالنَّبِيِّينَ وَآتَى الْمَالَ عَلَىٰ حُبِّهِ ذَوِي الْقُرْبَىٰ وَالْيَتَامَىٰ وَالْمَسَاكِينَ وَابْنَ السَّبِيلِ وَالسَّائِلِينَ وَفِي الرِّقَابِ وَأَقَامَ الصَّلَاةَ وَآتَى الزَّكَاةَ وَالْمُوفُونَ بِعَهْدِهِمْ إِذَا عَاهَدُوا وَالصَّابِرِينَ فِي الْبَأْسَاءِ وَالضَّرَّاءِ وَحِينَ الْبَأْسِ أُولَٰئِكَ الَّذِينَ صَدَقُوا وَأُولَٰئِكَ هُمُ الْمُتَّقُونَ ١٧٧

لَّيْسَ laysa · It is not

Righteousness is not that you turn your faces toward the east or the west, but [true] righteousness is [in] one who believes in Allāh, the Last Day, the angels, the Book, and the prophets and gives wealth, in spite of love for it, to relatives, orphans, the needy, the traveler, those who ask [for help], and for freeing slaves; [and who] establishes prayer and gives zakāh; [those who] fulfill their promise when they promise; and [those who] are patient in poverty and hardship and during battle. Those are the ones who have been true, and it is those who are the righteous. (Surah Al-Baqarah, 2:177)