Ibn Majah

1؎: Imam Ahmad says that I neither prohibit these two units (rak‘ahs) after witr, nor do I perform them myself, and Imam Malik has rejected them. Nawawi says: The Prophet (sallallahu alayhi wa sallam) performed these two units sitting, in order to demonstrate that performing supererogatory (nafl) prayers after witr is permissible; he (sallallahu alayhi wa sallam) did not perform them regularly. Qadi ‘Iyad did not accept these narrations. Hafiz Ibn Hajar says that perhaps this is for the traveler: when there is no hope of waking up for the night prayer (tahajjud), he should perform these two units after witr and then sleep. As is narrated from Thawban (radi Allahu anhu): We were with the Prophet (sallallahu alayhi wa sallam) on a journey, and he (sallallahu alayhi wa sallam) said: “Travel is a hardship, so when any of you has performed witr, let him perform two units (rak‘ahs); if he wakes up (later), then good, otherwise these two units will suffice for him in place of the night prayer (tahajjud),” «واللہ اعلم».