question #1 Sahih Muslim 94a, Book 1, Hadith 178 : What is the significance of not associating anything with Allah in Islam?

Gabriel came to me and gave me the tidings: Verily he who died amongst your Ummah without associating anything with Allah would enter Paradise. I (the narrator) said: Even if he committed adultery and theft. He (the Holy Prophet) said: (Yes), even if he committed adultery and theft.