How Do You Know? (Ahadith 1033 - 1034)

Volume 2, Book 23, Number 334:
Narrated Kharija bin Zaid bin Thabit:
Um Al-'Ala', an Ansari woman who gave the pledge of allegiance to the Prophet said to me, "The emigrants were distributed amongst us by drawing lots and we got in our share 'Uthman bin Maz'un. We made him stay with us in our house. Then he suffered from a disease which proved fatal. When he died and was given a bath and was shrouded in his clothes, Allah's Apostle came. I said, 'May Allah be merciful to you, O Abu As-Sa'ib! I testify that Allah has honored you'. The Prophet said, 'How do you know that Allah has honored him?' I replied, 'O Allah's Apostle! Let my father be sacrificed for you! On whom else shall Allah bestow His honor?' The Prophet said, 'No doubt, death came to him. By Allah, I too wish him good, but by Allah, I do not know what Allah will do with me though I am Allah's Apostle.' By Allah, I never attested the piety of anyone after that."
Volume 2, Book 23, Number 335:
Narrated Al-Laith as above.
No matter how pious or evil a person was, no matter which circumstances they died in, no matter what, we can not judge their end result. We can not say if Allah is pleased with them or not. We can not say if they'll go to Paradise or not. We can not say anything. So be careful.
Saying someone is pious and righteous is one thing. But saying that they'll definitely enter Paradise because of their piety is another. Get it? The latter behavior is discouraged. Because. We. Don't Know.