C24 · Sunan An-Nasa’i - The Book of Forgetfulness (In Prayer), Hadith 1303 (Grade: Sahih - Authentic, Darussalam)
عَنْ مُعَاذِ بْنِ جَبَلٍ، قَالَ أَخَذَ بِيَدِي رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ " إِنِّي لأُحِبُّكَ يَا مُعَاذُ " . فَقُلْتُ وَأَنَا أُحِبُّكَ يَا رَسُولَ اللَّهِ . فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " فَلاَ تَدَعْ أَنْ تَقُولَ فِي كُلِّ صَلاَةٍ رَبِّ أَعِنِّي عَلَى ذِكْرِكَ وَشُكْرِكَ وَحُسْنِ عِبَادَتِكَ "
It was narrated that Mu'adh bin Jabal said: "The Messenger of Allah (ﷺ) took my hand and said: 'I love you, O Mu'adh!' I said: 'And I love you, O Messenger of Allah (ﷺ).' Then the Messenger of Allah (ﷺ) said: 'Never forget to say in every prayer: Rabbi a'inni 'ala dhikrika wa shukrika wa husni 'ibadatik (My Lord, help me to remember You, give thanks to You and worship You well.)"
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