Why are passages from Acts used as Old Testament passages after Easter?
It appears that the tradition of using Acts instead of the Old Testament is a very ancient one, established in the early Church. According to the Consultation on Common Texts,”Revised Common Lectionary,” Nashville: Abingdon Press, 1992, pg. 13: “A final concern in relation to the Easter cycle has to do with the disuse of the Hewbrew Scriptures during the season of Easter in the Roman lectionary (a practice mentioned by Augustine in the fifth century). Following the liturgical tradition of the Ambrosian and Hispanic rites in the West and also that of the majority of the Churches in the East, the Roman lectionary of 1969 does not use the Old Testament during the Great Fifty Days from Easter to Pentecost.
It appears that the tradition of using Acts instead of the Old Testament is a very ancient one, established in the early Church. According to the Consultation on Common Texts,”Revised Common Lectionary,” Nashville: Abingdon Press, 1992, pg. 13: “A final concern in relation to the Easter cycle has to do with the disuse of the Hebrew Scriptures during the season of Easter in the Roman lectionary (a practice mentioned by Augustine in the fifth century). Following the liturgical tradition of the Ambrosian and Hispanic rites in the West and also that of the majority of the Churches in the East, the Roman lectionary of 1969 does not use the Old Testament during the Great Fifty Days from Easter to Pentecost.