Making up the Night Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 76
وَ سَأَلَهُ سُلَيْمَانُ بْنُ خَالِدٍ: عَنْ قَضَاءِ اَلْوَتْرِ بَعْدَ اَلظُّهْرِ فَقَالَ «اِقْضِهِ وَتْراً أَبَداً كَمَا فَاتَكَ.
Sulaiman ibn Khalid asked Imam عليه السلام about making up the Witr prayer after midday. Imam عليه السلام said: "Make it up as a single (Witr) always, just as it was missed."
- Ṣaḥīḥ al-Faqīh, p. 71