Ibn Muhayriz said: A man from Banu Kinanah, named al-Makhdaji, heard a person called AbuMuhammad in Syria, saying: The witr is a duty (wajib). Al-Makhdaji said: So I went to Ubadah ibn as-Samit and informed him. Ubadah said: AbuMuhammad told a lie. I heard the Messenger of Allah ﷺ say: There are five prayers which Allah has prescribed on His servants. If anyone offers them, not losing any of them, and not treating them lightly, Allah guarantees that He will admit him to Paradise. If anyone does not offer them, Allah does not take any responsibility for such a person. He may either punish him or admit him to Paradise. (Using translation from Abū Dāʾūd 1420)
أَخْبَرَهُ وَكَانَ يَسْكُنُ بِالشَّامِ وَكَانَ أَدْرَكَ مُعَاوِيَةَ أَنَّ الْمُخْدَجِيَّ رَجُلٌ مِنْ بَنِي كِنَانَةَ أَخْبَرَهُ أَنَّ رَجُلًا مِنْ الشَّامِ وَكَانَتْ لَهُ صُحْبَةٌ يُكْنَى أَبَا مُحَمَّدٍ أَخْبَرَهُ أَنَّ الْوِتْرَ وَاجِبٌ فَرَاحَ الْمُخْدَجِيُّ إِلَى عُبَادَةَ بْنِ الصَّامِتِ فَذَكَرَ ذَلِكَ لَهُ فَقَالَ عُبَادَةُ كَذَبَ أَبُو مُحَمَّدٍ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «خَمْسُ صَلَوَاتٍ كَتَبَهُنَّ اللَّهُ عَلَى الْعِبَادِ مَنْ أَتَى بِهِنَّ لَمْ يُضَيِّعْ مِنْ حَقِّهِنَّ شَيْئًا اسْتِخْفَافًا بِحَقِّهِنَّ كَانَ لَهُ عِنْدَ اللَّهِ عَهْدٌ أَنْ يُدْخِلَهُ الْجَنَّةَ وَمَنْ لَمْ يَأْتِ بِهِنَّ جَاءَ وَلَيْسَ لَهُ عِنْدَ اللَّهِ عَهْدٌ إِنْ شَاءَ عَذَّبَهُ وَإِنْ شَاءَ أَدْخَلَهُ الْجَنَّةَ»