Making up the Night Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 76
وَ سَأَلَهُ حَمَّادُ بْنُ عُثْمَانَ فَقَالَ لَهُ: أُصْبِحُ عَنِ اَلْوَتْرِ إِلَى اَللَّيْلِ فَكَيْفَ أَقْضِي فَقَالَ «مِثْلاً بِمِثْلٍ.
Hammad ibn Uthman asked Imam عليه السلام and said: "I wake up after missing the Witr until the night. How do I make it up?" Imam عليه السلام said: "Like for like."
- Ṣaḥīḥ al-Faqīh, p. 71