'Appointed Time' in the Bible

“Speak to the Israelites and tell them: These are My appointed times, the times of the Lord that you will proclaim as sacred assemblies.

“These are the Lord’s appointed times, the sacred assemblies you are to proclaim at their appointed times.

“These are the Lord’s appointed times that you are to proclaim as sacred assemblies for presenting fire offerings to the Lord, burnt offerings and grain offerings, sacrifices and drink offerings, each on its designated day.

So Moses declared the Lord’s appointed times to the Israelites.