Because of her respect, obedience, kindness, and patience, she was very precious to the Holy Prophet (saww). He said, “Khadijah (sa) believed in me when everyone else disbelieved, she held me truthful when others called me a liar, she sheltered me when others abandoned me, and comforted me when others shunned me.”
When Janabe Khadijah (sa) passed away, Angel Jibra’il (a) asked the Holy Prophet (saww) to describe her in a few words. He (s) said, “She was the most truthful.” 
She passed away 25 years after her marriage with the Holy Prophet (saww) and is buried in Jannat al Mu’alla on the outskirts of Makkah.