Chronicles of Jerahmeel, by M. Gaster , at sacred-texts.com
XIX. (1) The sages tell that the dead have a large habitation, in front of which there flows a brook from the Garden of Eden, and by the side of this brook is a field. On every Sabbath eve between the afternoon and evening services the souls of the dead go forth from their secret abode and eat on this field and drink from this brook, (2) and every Israelite who drinks water between the afternoon and evening services of the Sabbath robs the dead. When the congregation on Sabbath eve exclaim, 'Bless the Lord, who is blessed,' they return to their graves, and God revives them, and causes them to stand upon their feet alive; (3) and all the dead of Israel rest on the Sabbath, and all stand up alive from their graves, and great multitudes come before God and sing praises unto Him upon their graves, and going to the synagogues, prostrate
themselves before Him, as it is said, 'The pious exult in honour, and they sing upon their resting-places.'
(4) Every Sabbath and every new moon they rise from their graves, and coming before the Divine Presence, prostrate themselves before Him, as it is said, 'And the people of the earth shall worship Me, on Sabbaths and on the new moons.' What is meant by the people of the earth? Those who are hidden in the earth, as it is written, 'And it shall come to pass that on each new moon and upon each Sabbath all flesh shall come to worship Me.'