Augustine of Hippo
The period of fifty days is documented not only within the Gospel but also throughout the Scriptures, particularly as it relates to the outpouring of the Holy Spirit (Acts 2:14) and in the texts of the Old Testament. Following the observance of the Passover, marked by the sacrifice of the lamb, this fifty-day interval leads to the moment when the Law, inscribed by the very hand of God, was bestowed upon Moses on Mount Sinai. The Gospel makes it clear that the reference to the finger of God alludes to the Holy Spirit (Luke 11:20).
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On Pentecost, which occurs fifty days after His suffering and resurrection, the promised Holy Spirit, the Comforter, was sent to us (Acts 2:14). This forthcoming event was foreshadowed during the Jewish Passover: on the fiftieth day after the lamb was sacrificed, Moses received the Law inscribed by God’s finger on the mountain (Exodus 31:18). Consult the Gospel where the Holy Spirit is referred to as the finger of God (Luke 11:20).