It is not like the obligatory prayer, but it is a Sunnah that was done by the Messenger of Allah ﷺ and his Companions, and they continued doing it until the end of their lives.
أَمَّا كَالْفَرِيضَةِ فَلَا وَلَكِنَّهَا سُنَّةٌ صَنَعَهَا رَسُولُ اللهِ ﷺ وَأَصْحَابُهُ حَتَّى مَضَوْا عَلَى ذَلِكَ
Witr is not a must, but it is a Sunnah that was established by the Messenger of Allah ﷺ .
الْوَتْرُ لَيْسَ بِحَتْمٍ وَلَكِنَّهُ سُنَّةٌ سَنَّهَا رَسُولُ اللهِ ﷺ
قَالَ أَمَّا الْفَرِيضَةُ فَلَا وَلَكِنَّهَا سُنَّةٌ سَنَّهَا رَسُولُ اللَّهِ ﷺ وَأَصْحَابُهُ حَتَّى مَضَوْا عَلَى ذَلِكَ
أَنَّهُ قَالَ الْوِتْرُ لَيْسَ بِفَرِيضَةٍ وَلَكِنَّهَا سُنَّةٌ سَنَّهَا رَسُولُ اللَّهِ ﷺ
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