Hadith On Obligatory Status Of Witr
Ahadith are the indirect narrations; therefore, they cannot be an independent source to determine an independent Hukm. The Quran has made it clear that Tahajjud is not obligatory on common Muslims; it was obligatory to the Prophet only. وَمِنَ اللَّيْلِ فَتَهَجَّدْ بِهِ نَافِلَةً لَّكَ عَسَىٰ أَن يَبْعَثَكَ رَبُّكَ مَقَامًا مَّحْمُودًا The narrator might have misreported it, or the prophet was just encouraging the Muslims to say the Tahajjud.