Three days after Salih's warning, thunderbolts filled the air, followed by severe earthquakes which destroyed the entire tribe and its homeland. The land was violently shaken, destroying all living creatures in it. There was one terrific cry which had hardly ended when the disbelievers of Salih's people were struck dead, one and all, at the same time. Neither their strong buildings nor their rock-hewn homes could protect them.
"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