Bismillahi walhamdulillahi ‘alaa rasulillah,
Once Aisha asked him if Khadijah had been the only woman worthy of his love. The Prophet (peace and blessings of Allah be upon him) replied:
"She believed in me when no one else did; she accepted Islam when people rejected me; and she helped and comforted me when there was no one else to lend me a helping hand." It had been related by Abu Hurairah (may Allah be pleased with him) that on one occasion, when Khadijah was still alive, Jibril came to the Prophet (peace and blessings of Allah be upon him) and said, "O Messenger of Allah, Khadijah is just coming with a bowl of soup (or food or drink) for you. When she comes to you, give her greetings of peace from her Lord and from me, and give her the good news of a palace of jewels in the Garden, where there will be neither any noise nor any tiredness." After the Prophet's uncle, Abu Talib, and his first wife, Khadijah, had both died in the same year, the Prophet Muhammad (peace and blessings of Allah be upon him) and his small community of believers endured a time of great hardship and persecution at the hands of the Quraish. Indeed the Prophet, who was now fifty years old, name this year 'the Year of Sorrow.'
(from the book Wives of the Prophet Muhammad (PBUH) by Ibn Kathir)