Muhammad bin Abdur Rahman narrates: Sayyiduna Sa’d bin Abi Waqqas (may Allah be pleased with him) performed the ‘Isha prayer, then performed one rak’ah of Witr. So a person asked him:“O Abu Ishaq! Did I not see you performing one rak’ah of Witr?”So he inquired, and Sayyiduna Sa’d said:“O blind one! Will you teach me my religion?”