Jesus washed his disciples feet.
Red herring. They weren't slaves he had paid a merchant for.
The core of Jesus teachings was that ALL are equal, even ones enemies and even ones "slaves" for all our slaves.
Only spiritually.
IF and the key is IF, one beleives that God is Good and God is Love
God was good AND he was love. He was good at killing and hot damn did he love doing it. Jesus beleived in the flood where god killed....well, pretty much everyone, babies included, never said "yeah, that was kind of a dick move by Dad."