The Ascension of Jesus (anglicized from the Vulgate Latin Acts 1:9-11 section title: Ascensio Iesu) is the Christian teaching found in the New Testament that the resurrected Jesus was taken up to heaven in his resurrected body, in the presence of eleven of his apostles, occurring
40 days after the resurrection. In the biblical narrative, an angel tells the watching disciples that Jesus' second coming will take place in the same manner as his ascension.
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http://en.wikipedia.org/wiki/Ascension_of_Jesus)
Pentecost (Ancient Greek: Πεντηκοστή [ἡμέρα], Pentēkostē [hēmera], "
the fiftieth [day]") is the Greek name for the Feast of Weeks, a prominent feast in the calendar of ancient Israel celebrating the giving of the Law on Sinai. This feast is still celebrated in Judaism as Shavuot.
Later, in the Christian liturgical year, it became a feast commemorating
the descent of the Holy Spirit upon the Apostles and other followers of Jesus Christ, (120 in all) as described in the Acts of the Apostles 2:1–31. For this reason, Pentecost is sometimes described by some Christians today as the "Birthday of the Church."
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The Talmud refers to Shavuot as Atzeret (Hebrew: עצרת, literally, "refraining" or "holding back"), referring to the prohibition against work on this holiday and to the conclusion of the holiday and season of Passover. Since
Shavuot occurs 50 days after Passover, Hellenistic Jews gave it the name Pentecost.(πεντηκοστή, "fiftieth day").[citation needed]
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The biblical narrative of Pentecost is given in the second chapter of the Book of Acts. Present were about one hundred twenty followers of Christ (Acts 1:15), including his core group of twelve Disciples (Acts 1:13, 26), his mother Mary and various other women disciples (Acts 1:14). Their reception of Baptism in the Holy Spirit in the Upper Room is recounted in Acts 2:1–6:[4]
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http://en.wikipedia.org/wiki/Pentecost)