Hadith 1522
Muadh bin Jabal reported that the Messenger of Allah ﷺ caught his hand and said: By Allah, I love you, Muadh. 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. " Muadh willed this supplication to the narrator al-Sunabihi and al-Sunabihi to Abu Abdur-Rahman.
Hadith 3656
Narrated Muawiyah: The Holy Prophet ﷺ forbade the discussion of thorny questions.