Is it permissible to send supplications (duas) and ذكر (dhikr) or explanations of hadith via email with the intention of a جاریة (perpetual charity), or to buy valuable religious books and donate them as a جاریة (perpetual charity)? Is it permissible to bestow the reward of this action upon the deceased mother, and will the deceased benefit from this reward? And how does the deceased benefit from people's supplications for them and charity on their behalf, and what is the meaning of a man being given glad tidings of his son's righteousness after his death?

Sending supplications (du'as), remembrances (adhkar), and calling to good are righteous deeds for which the doer is rewarded. It is permissible to dedicate their reward to the deceased, as it benefits them and raises their ranks. These actions are considered ongoing charity (sadaqah jariyah) if they are in the form of an endowment (waqf). It has been reported that the believer is given good tidings of his child's righteousness after his death. This is the view of some scholars: that the deeds of the living are presented to their deceased, who then rejoice at good and grieve over evil. The deceased's rejoicing at the righteousness of his child may be due to the supplication and seeking of forgiveness reaching him from his child, as the deeds of the deceased cease except for three: an ongoing charity, knowledge from which benefit is derived, or a righteous child who supplicates for him.