In his book HAVE A LITTLE FAITH, Mitch Albom relates an incident in which he was visiting his rabbi who was near death. The rabbi, an excellent teacher of the OT, was telling Mitch how important forgiveness was. He says, “that’s why our sages tell us to repent exactly one day before we die.” Mitch responded,

“But how do we know it’s the day before we die?” he asked. The rabbi raised his eyebrows…”.Precisely.”