Jubilees 22:1,4-6
[1]And it came to pass in the first week in the forty-fourth jubilee, in the second year, that is, the year in which Abraham died, that Isaac and Ishmael came from the Well of the Oath to celebrate the feast of weeks -that is, the feast of the first fruits of the harvest-to Abraham, their father, and Abraham rejoiced because his two sons had come.
[4]And he offered a thank offering and made a feast of joy before Ishmael, his brother: and Rebecca made new cakes from the new grain, and gave them to Jacob, her son, to take them to Abraham, his father, from the first fruits of the land, that he might eat and bless the Creator of all things before he died.
[5]And Isaac, too, sent by the hand of Jacob to Abraham a best thank offering, that he might eat and drink.
[6]And he eat and drank, and blessed the Most High Yah, Who hath created heaven and earth, Who hath made all the fat things of the earth, And given them to the children of men That they might eat and drink and bless their Creator.