an adjective denoting "fifieth," is used as a noun, with "day" understood, i.e., the "fifieth" day after the Passover, counting from the second day of the Feast, Acts 2:1; 20:16; 1 Corinthians 16:8 . For the Divine instructions of Israel see Exodus 23:16; 34:22; Leviticus 23:15-21; Numbers 28:26-31; Deuteronomy 16:9-11 .