Quran 6:19

Say, ‘What counts most as a witness?’ Say, ‘God is witness between you and me. This Quran was revealed for me to warn you [people] and everyone it reaches. Do you really bear witness that there are other gods beside God?’ Say, ‘I myself do not bear witness [to any such thing].’ Say, ‘He is only one God, and I disown whatever you join with Him.’