Leviticus 23:16

Sacrifice. Hebrew mincha, which relates to the offerings of corn and liquors. Two loaves of wheaten flour leavened, were presented probably by the nation. This festival was instituted in memory of the law being given from Mount Sinai, which was a figure of the law of grace promulgated by the Holy Ghost and by the apostles, on the day of Pentecost. (Calmet)