The Prophet [SAW] said: "The major sins are: Associating others with Allah, disobeying parents, killing a soul (murder) and swearing a false oath knowingly."
عَنِ النَّبِيِّ ﷺ قَالَ الْكَبَائِرُ الإِشْرَاكُ بِاللَّهِ وَعُقُوقُ الْوَالِدَيْنِ وَقَتْلُ النَّفْسِ وَالْيَمِينُ الْغَمُوسُ