The Prophet ﷺ asked a man, "What do you say in your prayer?"The man replied, "I recite the tashahhud, then I say, 'O Allah, I ask You for Paradise and seek refuge with You from the Fire.' I do not know your soft murmurings or those of Muaz."The Prophet ﷺ said, "It is around these very things that we murmur."
حدثنا معاوية بن عمرو قال حدثنا زائدة عن الأعمش عن أبي صالح
قال النبي ﷺ لرجل كيف تقول في الصلاة قال أتشهد ثم أقول اللهم إني أسألك الجنة وأعوذ بك من النار أما إني لا أحسن دندنتك ولا دندنة معاذ فقال النبي ﷺ حولها ندندن
Its isnad is sahih. Muawiya bin Amr is Ibn Muhallab Azdi, Abu Amr Baghdadi, known as Ibn Kirmani. He is trustworthy according to everyone, they have praised him, and his hadith is accepted by the group. The rest of the narrators are well known.The hadith was narrated by Abu Dawud, 1/210, no. 792, in the book of Prayer, chapter on shortening the prayer, and Ibn Majah, 1/295, no. 910, in the book of establishing the prayer, chapter on what is said in the tashahhud, and Ibn Khuzayma, 1/359, no. 725, and Ibn Hibban, 3/149, no. 868 in Ihsan, via the route of Amash from Abu Salih from Abu Hurairah, that a man...