'Dead' in the Bible

“You are the sons of the Lord your God; you shall not cut yourselves nor shave your forehead for the sake of the dead.

or one who casts a spell, or a medium, or a spiritist, or one who calls up the dead.

It shall be that the firstborn whom she bears shall assume the name of his dead brother, so that his name will not be blotted out from Israel.

I have not eaten of it while mourning, nor have I removed any of it while I was unclean, nor offered any of it to the dead. I have listened to the voice of the Lord my God; I have done according to all that You have commanded me.