The beloved Wife of the Holy Prophet (pbuh). The most loved wife of the Prophet. She is the "Mother of the Faithful."
Useful information: Muhammad (s.a.w.a.) marries Khadijah
Now, Muhammad (s.a.w.a.) was old enough to go with the trade caravans. But Abu Talib's financial position had become very weak because of the expenses of Rifadah and Siqayah, and it was no longer possible for him to equip Muhammad (s.a.w.a.) with the merchandise on his own. He, therefore, advised him to act as agent for a noble lady, Khadijah bint Khuwaylid, who was the wealthiest person in Quraish. It is written that in the trade caravans, her merchandise usually equaled the merchandise of the whole tribe put together.
Her genealogy joins with that of the Holy Prophet at Qusayi. She was Khadijah daughter of Khuwaylid ibn Asad ibn 'Abdul-'Uzza ibn Qusayi.
The reputation which Muhammad (s.a.w.a.) enjoyed for his honesty and integrity, led Khadijah to willingly entrust her goods to him for sale in Syria. He traded in such a way that the goods earned more profit than expected, and yet he was praised for his integrity, honesty and generosity. Khadijah was very much impressed. Only two months after his return to Mecca, he was married to Khadijah. He was twenty-five years of age and Khadijah was forty and a widow.