Deuteronomy 20:16-17 (Violence and Genocide):

"However, in the cities of the nations the Lord your God is giving you as an inheritance, do not leave alive anything that breathes. Completely destroy them—the Hittites, Amorites, Canaanites, Perizzites, Hivites and Jebusites—as the Lord your God has commanded you."
This passage is controversial because it appears to command the Israelites to commit genocide against the inhabitants of the land of Canaan. Critics argue that this instruction is a direct contradiction of modern ethical standards and the concept of a merciful, loving God.

Exodus 21:20-21 (Slavery):

"Anyone who beats their male or female slave with a rod must be punished if the slave dies as a direct result, but they are not to be punished if the slave recovers after a day or two, since the slave is their property."
This quote is often highlighted as one of the most morally troubling passages. It explicitly distinguishes between the punishment for killing a slave versus a freeman and seems to condone a level of violence against slaves, treating them as property rather than human beings.

Psalm 137:8-9 (Revenge and Infanticide):

"Daughter Babylon, doomed to destruction, happy is the one who repays you according to what you have done to us. Happy is the one who seizes your infants and dashes them against the rocks."
This verse, part of a lament from the Babylonian exile, is shocking due to its expression of a desire for violent revenge against enemies, specifically advocating for the brutal killing of their children. It stands in stark contrast to the common perception of biblical teachings on forgiveness and love.