The Israelites had lived in Egypt for 430 years. It was on the last day of the 430 years that all the Lord ‘s people left Egypt. They left in family groups, like an army. The Lord carefully watched his people all that night, when he brought them out of Egypt. Because of that, all Israelites must watch carefully during this special night. They and their descendants must do this every year, to thank the Lord .
Exodus 12:40-42
以色列人住在埃及共有四百三十年。 正滿了四百三十年的那一天,耶和華的軍隊都從埃及地出來了。 這夜是耶和華的夜;因耶和華領他們出了埃及地,所以當向耶和華謹守,是以色列眾人世世代代該謹守的。
出埃及記 12:40-42