Coldsteel
He did, however, allow it as it was an ancient custom.
God supposedly wanted to make Israel his special people amongst the nations. He gave them several commands to remember them they were different. Israel was not allowed to follow the customs of the land when it came to very important things like clothing (don't mix two fibres in one cloth, add a blue ribbon and fringes to you garment) or cooking (don't eat blood, no pork etc, don't boil a goat in his mother's milk).
Israel was not allowed to do these ancient customs.
But when it came to slavery and war crimes....well it would be too much to ask Israel to stop following the customs of the nations with that, right? It's not that human life and dignity is more important than clothing and cooking and having a day of.
And though they could be inherited, the Lord directed that on certain occasions and jubilees that the slaves be released with compensation.
Yeees, but only the Hebrew slaves were set free. All foreigners, POW and abducted girls were screwed for life (also literally) (Le 25)
So when the OP states that Jesus is God's image, it means that Jesus is more concerned with what you eat and how you dress than with human life and freedom.
Hey does that remind you of a certain religion?