Hadith 1564
It was narrated from Abu Sa’eed that the Prophet (ﷺ) forbade building structures over graves.
Hadith 4250
´It was narrated from Abu ‘Ubadah bin ‘Abdullah, that his father said:` “The Messenger of Allah (ﷺ) said: ‘The one who repents from sin is like one who did not sin.’”