because he saw it pleased the Jews - Popularity was the ruling passion of this Herod, not naturally so cruel as some of the family [Josephus, Antiquities, 19.7.3].
to take Peter also - whose loss, at this stage of the Church, would have been, so far as we can see, irreparable.
Then were the days of unleavened bread - seven in number, during which, after killing and eating the Passover, no leaven was allowed in Jewish houses (Exo 12:15, Exo 12:19).