Early in 628 C.E., the Holy Prophet decided to proceed to Makkah to perform the pilgrimage. He was accompanied by 1,400 companions including Uthman. When the Quraish of Makkah came to know that the Muslims were coming to Makkah, they sent Khalid and Ikramah bin Abu Jahl with two hundred horsemen to intercept the Muslims and prevent their advance to Makkah. Finding the main route to Makkah barred, the Muslims turned aside, and took an alternative unfrequented route to Makkah. The way led through rough rocks and ravines. After a weary march, the Muslims reached Hudaibiyah on the lower side of Makkah within the sacred precincts.
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari