The Prophet salla Allahu alaihi wa sallam when asked by a Bedouin about
night prayer, he replied: night prayer is in twos twos! But if you fear
Fajr, offer one Rakah witr.
If the number was important, the Prophet salla Allahu alaihi wa sallam
should not have neglected it, especially when the Bedouin were ignorant and in
need to know the rulings of night prayers.