The Jews knew that in their holy books, there were references to the advent of a prophet in Arabia. They were? however, under the impression that the expected prophet would rise from their midst. When the Holy Prophet rose
from the ranks of the Quraish in Makkah, the Jews recognized in him all the signs of prophethood foretold in their sacred books. When the Holy Prophet came to Madina the Jews thought that he would be subservient to them, and would have to depend upon them. When the Holy Prophet followed an independent policy based on the supremacy of Islam, the Jews followed the policy of betrayal, and embarked on a campaign of ridicule and vilification. Only a few Jews accepted Islam. Even some out of them were hypocrites, whose object in accepting Islam was to disrupt Islam from within. Those Jews who did not accept Islam remained hostile to Islam at heart.
"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