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In page Jacob:

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The Eastern Orthodox Church and those Eastern Catholic Churches which follow the Byzantine Rite see Jacob's dream as a prophecy of the incarnation of the Logos, whereby Jacob's ladder is understood as a symbol of the Theotokos (Virgin Mary), who, according to Eastern Orthodox theology, united heaven and earth in her womb.[citation needed] The biblical account of this vision[1] is one of the standard Old Testament readings at Vespers on Great Feasts of the Theotokos.