Regarding genitaI mutiIation?

The Old Testament disfavors it:
"No one whose testicles have been crushed or whose penis has been cut off may be admitted into the community of the Lord."
Deuteronomy 23:2

But the New Testament encourages castration:
"For there are eunuchs, that were so born from their mother's womb: and there are eunuchs, that were made eunuchs by men: and there are eunuchs, that made themselves eunuchs for the kingdom of heaven's sake. He that is able to receive it, let him receive it."

Matthew 19:12

So.. which verse should I willfully ignore this time?