Refrence of Quranic verse“ muslim slave better than non muslim slave ”

Question

What is the refrence of Quranic verse that approximately means:

A Muslim slave is better than non muslim slave and female muslim slave is better than non muslim female slave because muslims call towards Allah

Answer 1

And do not marry polytheistic women until they believe. And a believing slave woman is better than a polytheist, even though she might please you. And do not marry polytheistic men [to your women] until they believe. And a believing slave is better than a polytheist, even though he might please you. Those invite [you] to the Fire, but Allah invites to Paradise and to forgiveness, by His permission. And He makes clear His verses to the people that perhaps they may remember.

Al-Baqarah 221