Slavery in the Bible?

[1] "Now these are the judgments which you shall set before them: [2] "If you buy a Hebrew servant, he shall serve six years; and in the seventh he shall go out free and pay nothing. [3] "If he comes in by himself, he shall go out by himself; if he comes in married, then his wife shall go out with him. [4] "If his master has given him a wife, and she has borne him sons or daughters, the wife and her children shall be her master's, and he shall go out by himself. [5] "But if the servant plainly says, 'I love my master, my wife, and my children; I will not go out free,' [6] "then his master shall bring him to the judges. He shall also bring him to the door, or to the doorpost, and his master shall pierce his ear with an awl; and he shall serve him forever. [7] "And if a man sells his daughter to be a female slave, she shall not go out as the male slaves do. [8] "If she does not please her master, who has betrothed her to himself, then he shall let her be redeemed. He shall have no right to sell her to a foreign people, since he has dealt deceitfully with her. [9] "And if he has betrothed her to his son, he shall deal with her according to the custom of daughters. [10] "If he takes another wife, he shall not diminish her food, her clothing, and her marriage rights. [11] "And if he does not do these three for her, then she shall go out free, without paying money. (Exodus 21:1-11 NKJV)