"Reish Lakish said: It was manifestly known to the Master of the Universe, that in the future Haman was going to weigh out shekels against the People of Israel." We learn a moral reprimand from his words, that announce and inform us that in the People of Israel's moments of grace, when they were called 'sons of God' and 'God's Tribe', we were connected and united as one person, with no distancing between our hearts.
The whole person should not imagine that he lacks nothing, whether because of his wisdom or his wealth, and that he requires no assistance from others, for he is mistaken in such thinking - since he is but half a person and is incomplete without his brethren, the other half.
For this reason, our teachers of blessed memory carry the intention of a blessing with this commandment. It is a loud and clear proclamation, as is written: "On the first of the month of Adar a proclamation is made about the shekalim" – meaning that each one is to give half a shekel, symbolizing unity; in so doing each person will give from the heart, and be inspired to be at peace with his brethren. This is what Reish Lakish meant when he said: "It was revealed and known to the Master of the Universe, that in the future Haman was going to weigh out shekels against the People of Israel", meaning, to inform on them about unity, for they are not in unity.