John Chrysostom
Observe how the Lord initiates the law: the evangelist recounts that He summoned the people and proclaimed to them, “Hear and understand!” He does not merely announce this law to them; rather, through His humility and grace, He prepares their hearts to receive His message, as indicated by the phrase "having called." He seizes the opportune moment to articulate the law after rebuking the Pharisees, having vanquished them and condemned their actions with prophetic words, thus ensuring that the people are more receptive to His teachings. Furthermore, He not only calls them but also draws their attention: “Consider,” He urges, meaning to reflect and focus. The law I am about to present is indeed deserving of your contemplation.
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If the Pharisees upheld the law in order to cling to their traditions, and you paid them heed, how much more should you listen to Me, who at the right moment imparts the greater wisdom. However, He does not dismiss the significance of dietary laws, nor does He imply that Moses required them in vain or out of leniency; instead, He speaks with encouragement and counsel, using the essence of the matter as evidence. He states, “Not what goes into the mouth defiles a man, but what comes out of the mouth defiles a man.” Through the inherent truth of the matter, He articulates and validates the law.