'Reminder' in the Bible

The angel answered him, "Your prayers and your gifts to the poor have arisen as a reminder to God. Send men now to Joppa and summon Simon, who is called Peter.

However, on some points I have written to you rather boldly, both as a reminder to you and because of the grace given me by God

But in the sacrifices there is a reminder of sins every year.

I consider it right, as long as I am in this bodily tent, to wake you up with a reminder,

Dear friends, this is now the second letter I have written to you; in both letters, I want to develop a genuine understanding with a reminder,