Deuteronomy 22:8-9

“When you build a new house, you shall make a railing (parapet) around your [flat] roof, so that you do not bring the guilt of [innocent] blood on your house if someone falls from it. “You shall not sow your vineyard with two kinds of seed, or everything produced by the seed which you have sown and the yield of the vineyard will become defiled [and banned for use].