Why is it with the following quran verse that the following section in brackets is included endorsing niqab?

but it's ok to raid a village and get slave girls and have with them! sura 4:24 lawful are your wives and the captives your right hand possesses.sura 33:50 ''o'' prophet! lawful are your wives and the slave girls allah has given you from the spoils of war; 79:29-30 and dozens more;