Matthew 12:2-4

Amplified Bible

²But when the Pharisees saw this, they said to Him, “Look! Your disciples are doing what ^[a]is unlawful on the Sabbath.”^(A) ³He said to them, “Have you not read [in the Scriptures] what David did when he was hungry, he and those who accompanied him—^(B) ⁴how he went into the house of God, and they ate the ^[b]consecrated bread, which was not lawful for him to eat nor for those with him, but for the priests only?

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Footnotes

Matthew 12:2 Picking grain to eat was not forbidden on the Sabbath. It was ridiculous for the Pharisees to try to equate gleaning for food with reaping a harvest (which was forbidden on the Sabbath).
Matthew 12:4 The bread of the Presence, the twelve fresh loaves presented each Sabbath to the Lord in the Holy Place.