The Prophet [SAW] said: "The major sins are: Associating others with Allah, disobeying parents, killing a soul (murder) and swearing a false oath knowingly." (Using translation from Nasāʾī 4011)   

عَنِ النَّبِيِّ ﷺ قَالَ «الْكَبَائِرُ الْإِشْرَاكُ بِاللَّهِ وَعُقُوقُ الْوَالِدَيْنِ وَقَتْلُ النَّفْسِ شُعْبَةُ الشَّاكُّ أَوِ الْيَمِينُ الْغَمُوسُ»