Matthew 10:16-17

"Remember it is I who am sending you out, as sheep into the midst of wolves; prove yourselves as sagacious as serpents, and as innocent as doves.

Romans 3:8

And why should we not say--for so they wickedly misrepresent us, and so some charge us with arguing--"Let us do evil that good may come"? The condemnation of those who would so argue is just.

Treasury of Scripture Knowledge

Summary

But Gedaliah the son of Ahikam said unto Johanan the son of Kareah, Thou shalt not do this thing: for thou speakest falsely of Ishmael.

Bible References

Thou shalt

Matthew 10:16
"Remember it is I who am sending you out, as sheep into the midst of wolves; prove yourselves as sagacious as serpents, and as innocent as doves.
Romans 3:8
And why should we not say--for so they wickedly misrepresent us, and so some charge us with arguing--"Let us do evil that good may come"? The condemnation of those who would so argue is just.