"The Messenger of Allah ﷺ said to me: 'Do not be like so-and-so; he used to pray Qiyam Al-Lail then he stopped.'" (Using translation from Nasāʾī 1763)
قَالَ رَسُولُ اللهِ ﷺ يَا عَبْدَ اللهِ لَا تَكُونَنَّ مِثْلَ فُلَانٍ كَانَ يَقُومُ اللَّيْلَ فَتَرَكَ قِيَامَ اللَّيْلِ