“You will eat it as you would a barley cake and bake it over dried human excrement in their sight.” The Lord said, “This is how the Israelites will eat their bread — ceremonially unclean — among the nations where I will banish them.” But I said, “Oh, Lord God, I have never been defiled. From my youth until now I have not eaten anything that died naturally or was mauled by wild beasts. And impure meat has never entered my mouth.” He replied to me, “Look, I will let you use cow dung instead of human excrement, and you can make your bread over that.””
Ezekiel 4:12-15 HCSB
I read this and one thing jumps out at me. The Lord gives a command, but Ezekiel pleads with Him, and the Lord relents. Of course Ezekiel pleads that this would go against God’s commands, and perhaps that was part of the test to him, but I think that this shows the Lord is not inflexible, but at the same time it isn’t a ticket to sin.