Unfortunately, after the death of the Holy Prophet, the caliphate issue became a source of controversy among the Muslims, and has led to sectarian differences thereby adversely affecting the solidarity of the Ummah. There is a school of thought which holds that Ali alone had the right to succeed the Holy Prophet, and that the three Caliphs Abu Bakr, Umar, and Othman were usurpers. Another school of thought which commands majority does not subscribe to this view. We may examine some salient aspects of the issue.
"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