“the Pharisees went out and began to plot with the Herodians how they might kill Jesus.”
Quote from Mark Buchanan's The Rest of God:
Legalism is the reduction of life to mere technicalities. It substitutes code for conscience, ritual for worship, rectitude for holiness, morality for purity. The most bizarre lines of reasoning appear natural to the legalist: you must never heal on the Sabbath, but you can plot the death of those that do.