The Feast of the Passover: First and Last Days of, Holy Convocations
Source: TTT
Exodus 12:16
On the first day you are to hold a sacred assembly, and another on the seventh day. You must not do any work on those days, except to prepare the meals—that is all you may do.
Numbers 28:18, 25
On the first day there is to be a sacred assembly; you must not do any regular work. / On the seventh day you shall hold a sacred assembly; you must not do any regular work.