Albert Barnes Commentary Mark 14:1

"Now after two days was [the feast of] the passover and the unleavened bread: and the chief priests and the scribes sought how they might take him with subtlety, and kill him:" — Mark 14:1 (ASV)

And of unleavened bread. It was so called because at that feast, only bread made without leaven or yeast was used.

By craft. By subtlety (Matthew), that is, by some secret plan that would secure possession of him without arousing the opposition of the people.