It is narrated on the authority of Jabir that he heard the Apostle (may peace and blessings be upon him) saying. Verily between man and between polytheism and unbelief is the negligence of prayer. (Using translation from Muslim 82a)   

سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ إِنَّ بَيْنَ الرَّجُلِ وَبَيْنَ الشِّرْكِ وَالْكُفْرِ تَرْكُ الصَّلَاةِ  

"The Messenger of Allah ﷺ said: 'There is nothing between a person and disbelief except abandoning Salah.'" (Using translation from Nasāʾī 464)   

قَالَ رَسُولُ اللهِ ﷺ لَيْسَ بَيْنَ الْعَبْدِ وَالْكُفْرِ إِلَّا تَرْكُ الصَّلَاةِ  

[Machine] I heard the Messenger of Allah ﷺ saying, "Between a man and disbelief or polytheism is abandoning the prayer."  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ بَيْنَ الرَّجُلِ وَبَيْنَ الشِّرْكِ وَالْكُفْرِ تَرْكُ الصَّلَاةِ  

[Machine] The Messenger of Allah ﷺ said, "The difference between a servant (of Allah) and disbelief is the abandonment of prayer, and likewise…"  

قَالَ رَسُولُ اللهِ ﷺ بَيْنَ الْعَبْدِ وَبَيْنَ الْكُفْرِ تَرْكُ الصَّلَاةِ وَكَذَلِكَ  

[Machine] Abu Abdullah Al-Hafiz and Abu Abdullah Al-Salami narrated to us from the original text of his book, they said: Abu Abbas Al-Asamm narrated to us, Abu Abbas bin Muhammad Al-Douri narrated to us, Ali bin Al-Hassan bin Shaqiq narrated to us, Al-Husayn bin Waqid narrated to us, Narrated to us Abu Al-Qasim Abdullah bin Ali bin Abdullah Al-Muadhin, he informed us that Muhammad bin Ahmed Abu Bakr bin Khanb Al-Baghdadi narrated to us, Yahya bin Abi Talib informed us, Zaid bin Al-Hubab narrated to us, Al-Husayn bin Waqid narrated to us, Abdullah bin Buraidah bin Al-Husayb narrated to us from his father, that the Messenger of Allah ﷺ said: "The covenant between us and them is prayer, so whoever abandons it has disbelieved." In a narration by Ali, he said: The Messenger of Allah ﷺ said: "And the remaining prayers are equal." It was also narrated on the authority of Umar bin Al-Khattab that he said: "There is no share in Islam for the one who abandons the prayer." And on the authority of Ali, he said: "Whoever does not pray is a disbeliever." And on the authority of Abdullah bin Mas'ud, he said: "Whoever does not pray has no religion."  

أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو عَبْدِ الرَّحْمَنِ السُّلَمِيُّ مِنْ أَصْلِ كِتَابِهِ قَالَا ثنا أَبُو الْعَبَّاسِ الْأَصَمُّ ثنا الْعَبَّاسُ بْنُ مُحَمَّدٍ الدُّورِيُّ ثنا عَلِيُّ بْنُ الْحَسَنِ بْنِ شَقِيقٍ ثنا الْحُسَيْنُ بْنُ وَاقِدٍ ح وَأَخْبَرَنَا أَبُو الْقَاسِمِ عَبْدُ الْخَالِقِ بْنُ عَلِيِّ بْنِ عَبْدِ الْخَالِقِ الْمُؤَذِّنُ أنبأ مُحَمَّدُ بْنُ أَحْمَدَ أَبُو بَكْرِ بْنُ خَنْبٍ الْبَغْدَادِيُّ ثنا يَحْيَى بْنُ أَبِي طَالِبٍ أنبأ زَيْدُ بْنُ الْحُبَابِ ثنا الْحُسَيْنُ بْنُ وَاقِدٍ ثنا عَبْدُ اللهِ بْنُ بُرَيْدَةَ بْنِ الْحُصَيْبِ عَنْ أَبِيهِ أَنَّ رَسُولَ اللهِ ﷺ قَالَ الْعَهْدُ الَّذِي بَيْنَنَا وَبَيْنَهُمُ الصَّلَاةُ فَمَنْ تَرَكَهَا فَقَدْ كَفَرَ وَفِي حَدِيثِ عَلِيٍّ ؓ قَالَ قَالَ رَسُولُ اللهِ ﷺ وَالْبَاقِي سَوَاءٌ 6499 وَرُوِّينَا عَنْ عُمَرَ بْنِ الْخَطَّابِ ؓ أَنَّهُ قَالَ لَا حَظَّ فِي الْإِسْلَامِ لِمَنْ تَرَكَ الصَّلَاةَ 6499 وَعَنْ عَلِيٍّ ؓ مَنْ لَمْ يُصَلِّ فَهُوَ كَافِرٌ 6499 وَعَنْ عَبْدِ اللهِ بْنِ مَسْعُودٍ مَنْ لَمْ يُصَلِّ فَلَا دِينَ لَهُ