The Christian Feast of Pentecost is the fulfillment of Jewish agrarian festival. For on this day we commemorate the anniversary of Christ Jesus giving His people the Holy Spirit, which He said would guide us to all truth (Cf. Jn. 15:13), and teach us everything and remind us all that Jesus taught us (Cf. Jn. 14:26). In the Old Covenant the Law was written on tablets and parchment, but God’s sharing with the Holy Spirit is the fulfillment of the promise that YHWH made to Jeremiah that in the New Covenant, “I will place my law within them, and write it upon their hearts; I will be their God and they shall be my people.” (Jer. 31:33).