The Wisdom of Israel, by Edwin Collins, , at sacred-texts.com
All the reward of the righteous is prepared for them in the world to come, but the Holy One, blessed be He, shows it to them while they are yet in this world; so that their souls are satisfied and they go to sleep in peace, and death has no terror for them.
Rabbi Eliezer says: "This may be likened to a feast that was made by a certain king. He invited wayfarers to the feast, but when they came, weary and travel-stained, he wished that they should rest before the banquet. So he showed them the good provision he had made for them, and said: 'See, this is what you will eat and drink in my palace.' Then they laid them down and slept content." In like manner the Holy One, blessed be He, shows to the righteous, while they are yet in this world, what they are destined to enjoy in the world to come, and they lie down to sleep: with peaceful souls they accept the summons to depart from this life.
There is no material food in heaven; the angels feed on the light of the Divine Presence. (The righteous have, in this world, seen a vision of the light of God's presence.)