C23 · Sunan Abu Dawud - Prayer (Kitab Al-Salat): Detailed Injunctions about Witr, Hadith 1522 (Grade: Sahih - Authentic, Al-Albani)
عَنْ مُعَاذِ بْنِ جَبَلٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم أَخَذَ بِيَدِهِ وَقَالَ " يَا مُعَاذُ وَاللَّهِ إِنِّي لأُحِبُّكَ وَاللَّهِ إِنِّي لأُحِبُّكَ " . فَقَالَ " أُوصِيكَ يَا مُعَاذُ لاَ تَدَعَنَّ فِي دُبُرِ كُلِّ صَلاَةٍ تَقُولُ اللَّهُمَّ أَعِنِّي عَلَى ذِكْرِكَ وَشُكْرِكَ وَحُسْنِ عِبَادَتِكَ " . وَأَوْصَى بِذَلِكَ مُعَاذٌ الصُّنَابِحِيَّ وَأَوْصَى بِهِ الصُّنَابِحِيُّ أَبَا عَبْدِ الرَّحْمَنِ
Mu'adh b. Jabal reported that the Messenger of Allah (ﷺ) caught his hand and said: By Allah, I love you, Mu'adh. I give some instruction to you. Never leave to recite this supplication after every (prescribed) prayer: "O Allah, help me in remembering You, in giving You thanks, and worshipping You well." Mu'adh willed this supplication to the narrator al-Sunabihi and al-Sunabihi to 'Abu Abd al-Rahman.
View in verification table: