Hadith.2149 - Imam (as) said: "Entering the Kaaba is an entry into the mercy of Allah (swt), and exiting it is an exit from sins, making one protected for the remainder of their life, with forgiveness granted for all past sins."
Al-Kāfi #1993“Ja’far (a.s.), has said, ‘I asked my father (a.s.), about entering al-Ka‘bah. He said, ‘Entering al-Ka‘bah is entering in the mercy of...