Sifrei_mitzvot for Exodus 23:1

לֹ֥א תִשָּׂ֖א שֵׁ֣מַע שָׁ֑וְא אַל־תָּ֤שֶׁת יָֽדְךָ֙ עִם־רָשָׁ֔ע לִהְיֹ֖ת עֵ֥ד חָמָֽס׃ (ס)

Thou shalt not utter a false report; put not thy hand with the wicked to be an unrighteous witness.