It is mentioned in Jaani-ul-Akhbaar that the Holy Prophet (s.a.w.w) said:

Go on sending gifts to your dead.

The companions asked: “O Messenger of Allah! What can be a gift for the dead?

The Prophet (s.a.w.w) said: “Dua (prayer) and Sadaqah (spending money for poor).

Then he added: “Every Friday night, the spirits of the dead come to the first (nearest) sky and, standing in front of their homes, cry out weeping sorrowfully:

‘O my family members! O my children! O my parents and O my near and dear ones! Be kind to us. God will be kind to you. We have to account here for what wealth and property we had in the world and by which others are being benefitted there. Please do us some favour, be it through a dirham (coin) or bread or cloth. God will adorn you with a heavenly dress…’

Source: Maad, page 86 by Ayatollah Dastaghaib Shirazi (a.r)