Theophylact of Bulgaria
It was God's intention that the tribe of Levi, rather than the firstborn sons of the Hebrews, be set apart for Him. The count of the tribe of Levi was twenty-two thousand, while there were twenty-two thousand seventy-three firstborns. In place of these firstborns, who surpassed the tribe of Levi, God decided to allocate the priests a didrachma. This established the practice of offering the didrachma, equivalent to five shekels or two hundred ovols, to all firstborns collectively. Furthermore, given that the Lord Himself is the firstborn, He complied with this tax obligation to the priests.
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Feeling perhaps a sense of embarrassment toward Christ because of His miracles, they refrain from questioning Him directly and instead approach Peter, possibly with ulterior motives, implying, 'Your teacher is in opposition to the law; would he consent to pay the didrachma?'