הֶֽעָשִׁ֣יר לֹֽא־יַרְבֶּ֗ה וְהַדַּל֙ לֹ֣א יַמְעִ֔יט מִֽמַּחֲצִ֖ית הַשָּׁ֑קֶל לָתֵת֙ אֶת־תְּרוּמַ֣ת יְהוָ֔ה לְכַפֵּ֖ר עַל־נַפְשֹׁתֵיכֶֽם׃
The rich shall not give more, and the poor shall not give less, than the half shekel, when they give the offering of the LORD, to make atonement for your souls.
Read Jewish philosophical commentary on Exodus 30:15: and classical philosophical sources.