This week long sabbath occurs on the sixth day of the Hebrew month of Sivan (between May 15 and June 14 on the Gregorian calendar). Shavuot is Hebrew for “weeks.” This time is known to Christians as the time of Pentecost.
See 3 Moses 33:18; 4 Moses 4:7, 5:22, 9:17-20; 5 Moses 14:10- 11, 17; Deuteronomy 8:8, 16:9-11; Isaiah 9:2; Jeremiah 5:24.