I saw the Messenger of Allah (ﷺ) praying and a sound came from his breast like the rumbling of a mill owing to weeping.
Sunan Abi Dawud Book 2, Hadith 514
← Previous Hadith Sa'id ibn Ziyad ibn Subayh al-Hanafi said: I prayed by the side of Ibn Umar and I put my hands on my waist. When he finished his prayer, He said: This is a cross in prayer; the Messenger of Allah (ﷺ) used to forbid it.

Sunan Abi Dawud Book 2, Hadith 513 Next Hadith → Anyone who performs ablution and performs his ablution well, and then he offers two rak’ahs of prayers in a way that he does not forget ( anything in it), will be forgiven all his past sins.

Sunan Abi Dawud Book 2, Hadith 515