1 Yochanan 1:5-6

And this is the Besuras HaGeulah which we have heard from Him and which we proclaim to you, that HASHEM is Ohr (Light), and in Him choshech there is not any at all. If we make the claim that we have deveykus with Him and in the choshech walk, we speak sheker and have no halakhah in the Derech Emes.