1 Corinthians 11:19 in the World English Bible
For there also must be factions among you, that those who are approved may be revealed among you.
Context
18 For first of all, when ye come together in the church, I hear that there be divisions among you; and I partly believe it.
19 For there must be also heresies among you, that they which are approved may be made manifest among you.
20 When ye come together therefore into one place, this is not to eat the Lord’s supper.