Ibn 'Abbas reported that a man said, "Messenger of Allah, my mother died
without a will. Will it help her if I give sadaqa on her behalf?"
"Yes," he replied.
Narrated Abu Hurayra reported that the Messenger of Allah, may Allah bless him
and grant him peace, said, "When a person dies, all action is cut off for
him with the exception of three things:
sadaqa which continues, knowledge
which benefits, or a righteous child who makes supplication for him."
'Abdullah ibn Dinar reported that Ibn 'Umar passed by a bedouin during
a journey. The bedouin's father had been a friend of 'Umar's. The bedouin
said, "Am I not the son of so-and-so?" He said, "Yes, indeed." Ibn 'Umar
ordered that he be given a donkey which was following him. He also took off
his turban and gave it to him, One of the men with him said, "Wouldn't two
dirhams be enough for him?" He replied, "The Prophet, may Allah bless him
and grant him peace, said, 'Maintain what your father loved. Do not cut it
off so that Allah puts out your light."
Ibn Sirin said, "We were with Abu Hurayra one night and he said, 'O Allah,
forgive Abu Hurayra and his mother and whoever asks for forgiveness for both
of them.'" Muhammad said, "We used to ask for forgiveness for them so that
we would be included in Abu Hurayra's supplication."