'Curb' in the Bible

Be ye not as a horse -- as a mule, Without understanding, With bridle and bit, its ornaments, to curb, Not to come near unto thee.

To the Overseer, to Jeduthun. -- A Psalm of David. I have said, 'I observe my ways, Against sinning with my tongue, I keep for my mouth a curb, while the wicked is before me.'

Keep a strong curb, however, on your youthful cravings; and strive for integrity, good faith, love, peace, in company with all who pray to the Lord with pure hearts.

For we all stumble and sin in many ways. If anyone does not stumble in what he says [never saying the wrong thing], he is a perfect man [fully developed in character, without serious flaws], able to bridle his whole body and rein in his entire nature [taming his human faults and weaknesses].

Curb every passion, and be on the alert. Your great accuser, the Devil, is going about like a roaring lion to see whom he can devour.