The court astrologers predicted that one of his sons would have a son at whose hands the Sassanian empire would come to grief, and Persia would become subject to foreign rule. Parwez felt much perturbed at this prediction. he placed a sexual embargo on his sons and decreed that none of them was to marry. His sons chafed at this decree. Shahryar his eldest son was secretly married by Shirin to a beautiful girl of a noble family. Of this union a son was born who was named Yazdjurd. The birth of the prince was kept a guarded secret.
"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