Verses with the word precept in the Old Testament (3 verses):

Isaiah 28:10
For precept must be upon precept, precept upon precept; line upon line, line upon line; here a little, and there a little:

Isaiah 28:13
But the word of the LORD was unto them precept upon precept, precept upon precept; line upon line, line upon line; here a little, and there a little; that they might go, and fall backward, and be broken, and snared, and taken.

Isaiah 29:13
Wherefore the Lord said, Forasmuch as this people draw near me with their mouth, and with their lips do honour me, but have removed their heart far from me, and their fear toward me is taught by the precept of men: