This Festival represent Yahweh harvesting the first-fruits of His Creation - it is called today "Pentecost" meaning fifty "50" base on the counting of 50 weeks from the time of the Passover Sacrifice the death and resurrection of Messiah Yahwehshua - see Acts 2.
Yahweh removes the sins from His People and the land as it is written...Zechariah 3:8-10 LEB...8 Listen, please, O Joshua the high priest, you and your companions that are sitting before you. For the men are a sign that, look, I am going to bring my servant the Branch. 9 For consider, the stone that I set before Joshua, on one stone are seven eyes. Look, I am going to engrave an inscription on it,’ declares Yahweh of hosts, ‘and I will remove the guilt of that land in a single day.