Acts 12:3

and when he saw that it pleased the Jews , he proceeded to arrest Peter also . This was during the days of Unleavened Bread .

When he saw that this met with approval among the Jews, he proceeded to seize Peter also. This happened during the Festival of Unleavened Bread.

And because he saw it pleased the Jews, he proceeded further to take Peter also. ( Then were the days of unleavened bread.)