I could have just quoted the verses and said nothing . That should be enough. It literally, step ,by step says what it means. Jesus is undoubtedly saying the he will raise his body up in three days . You couldn't find a clearer verse if you tried .It even says how the diciples understood it . You have two things. The explanation and how it was understood . Its a dream text to be certain of .
Have you been side tracked into whether Jesus did it Himself and not whether it was a bodily resurrection or as spirit is not being talked about? John 2:18-20 certainly shows a bodily resurrection.