Exodus 12:40-42

40Now the time that the children of IsraelH3478 dweltH3427 in EgyptH4714 was fourH702 hundredH3967 and thirtyH7970 yearsH8141. 41And it came to pass at the endH7093 of fourH702 hundredH3967 and thirtyH7970 yearsH8141, even the selfsame dayH3117 it came to pass, that all the hostsH6635 of Jehovah wentH3318 out from the landH776 of EgyptH4714. 42It is a nightH3915 to be much observed unto Jehovah for bringingH3318 them out from the landH776 of EgyptH4714: this is that nightH3915 of Jehovah, to be much observed of all the children of IsraelH3478 throughout their generationsH1755.