1 Corinthians 15:4

and that he was buried [and this also was according to the Scriptures-- Isaiah 53:9]; and that he hath been raised on the third day according to the scriptures [Psalms 16:10; Isaiah 53:10; Hosea 6:2; Jonah 2:10. Here the apostle reminds the Corinthians that the message which he delivered to them was one which he had received by divine revelation; that it consisted of three pre-eminent facts, namely, the death, burial and resurrection of the Lord; that of these facts the two which were hard to believe, i. e., the first and the last, were made more easy of belief by having been predicted in the Scriptures, the latter with minuteness, even as to the day. The apostle does not waste time proving the death; it was witnessed by thousands, it had never been denied by friend or enemy, and it was not now called in question by the Corinthians. The third item was the one called in question, and, having first proved it by a witness before the fact (the Scriptures), the apostle proceeds to refresh their minds as to how fully it had been proved by witnesses after the fact (viz.: the apostles and others), thus making them again aware that the resurrection was a literal, historical, objective fact. A fact so important and so difficult of belief demanded a host of witnesses, but Paul had them to produce; this thing was not done in a corner-- Acts 26:26];