Abu Muhayriz reported,

A man from the tribe of Banu Kinanah called al-Mukhdaji heard a man in Syria known as Abu Muhammad saying that the witr prayer is obligatory. Al-Mukhdaji said, "I went to Ubada bin Samit and intercepted him as he was on his way to the mosque, and I told him what Abu Muhammad had said."Ubada replied, "Abu Muhammad is wrong. I heard the Messenger of Allah ﷺ say, 'Five prayers has Allah, the Mighty and Majestic, prescribed upon His servants. Whoever performs them without neglecting any of them out of disregard for their right will have a covenant with Allah that He will admit him into Paradise. And whoever does not perform them has no covenant with Allah. If He wills, He will punish him, and if He wills, He will admit him into Paradise.'"

Azami 2784

Sahih

عن أبي محيريز

أن رجلا من بني كنانة يدعى المخدجي رجلا بالشام يكنى أبا محمد يقول: إن الوتر واجب. فقال سمع المخدجي: فرحت إلى عبادة بن الصامت، فاعترضت له وهو رائح إلى المسجد. فأخبرته بالذي قال أبو محمد، فقال عبادة: كذب أبو محمد، سمعت رسول الله ﷺ يقول: خمس صلوات كتبهن الله عزوجل على العباد، فمن جاء بهن لم يضيع منهن شيئا استخفافا بحقهن كان له عند الله عهد أن يدخله الجنة. ومن لم يأت بهن فليس له عند الله عهد. إن شاء عذبه، وإن شاء أدخله الجنة.

الأعظمي 2784صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Prayer
Chapter
Witr prayer
Section
Emphasis on Witr and that it is a sunnah, not obligatory
Numbering
Jami al-Kamil 2784 (2nd edition)
Azami 2784