Authorized Version
    For there must be also heresies among you, that they which are approved may be made manifest among you.

American Standard Version
    For there must be also factions among you, that they that are approved may be made manifest among you.

The Bible in Basic English
    For divisions are necessary among you, in order that those who have God's approval may be clearly seen among you.

The Darby Bible
    For there must also be sects among you, that the approved may become manifest among you.

The Webster Bible
    For there must be also heresies among you, that they who are approved may be made manifest among you.

Young's Literal Translation
    for it behoveth sects also to be among you, that those approved may become manifest among you;

World English Bible
    For there also must be factions among you, that those who are approved may be revealed among you.