Jesus could not have preached to anyone, dead or alive, while His dead body lay in the tomb. Why? Because He was dead! If He was not dead during those "three days and three nights in the heart of the earth" (Matthew 12:40), then His sacrifice for the sins of humanity was in vain!

Scripture says that, when Jesus died on the cross, like all men His "spirit [returned] to God who gave it" (Ecclesiastes 12:7; see Matthew 27:50; Luke 23:46; John 19:30). The spirit of a human is not conscious in death, for Solomon tells us plainly that "the dead know nothing" (Ecclesiastes 9:5). Thus, the spirit of a dead person cannot do anything: "for there is no work or device or knowledge or wisdom in the grave where you are going" (verse 10). As the psalmist writes, when a man dies, "His spirit departs, he returns to his earth; in that very day his plans [thoughts, KJV] perish" (Psalm 146:4; see also Job 14:20-21; Psalm 104:29).

Jesus, in order to taste death like every man (Hebrews 2:9), had to die just as every man does. He was completely dead for three days and three nights; He was without life and consciousness both in body and in spirit. He could do no preaching to anyone, much less "to the spirits in prison," whoever they are.