"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.)" (Using translation from Nasāʾī 1303)
أَخَذَ بِيَدِي رَسُولُ اللهِ ﷺ فَقَالَ «إِنِّي لَأُحِبُّكَ يَا مُعَاذُ» فَقُلْتُ وَأَنَا أُحِبُّكُ يَا رَسُولَ اللهِ فَقَالَ رَسُولُ اللهِ ﷺ «فَلَا تَدَعْ أَنْ تَقُولَ فِي كُلِّ صَلَاةٍ رَبِّ أَعِنِّي عَلَى ذِكْرِكَ وَشُكْرِكَ وَحَسَنِ عِبَادَتِكَ»