"Was Jesus “three days and three nights” in the grave to fulfill the “sign of Jonah”? Was the sign fulfilled in some other way, such as, was He crucified on Friday, on Thursday, or on Wednesday?

The heart of the earth has been erroneously interpreted to mean the grave, when in fact Jesus remained in the tomb two nights and rose on Sunday. This booklet, “The Sign of Jonah” explains what is symbolized by “the heart of the earth,” and shows the time it applies to. "