Narrated Ibn 'Abbas (May Allah be pleased with him)

The Prophet (ﷺ) said to a man, "Do you see the sun?" He replied, "Yes." He said, "Give witness in a similar case [which is as clear as the sun], or leave it." [Ibn 'Adi reported it with a Da'if (weak) chain or narrators, and al-Hakim graded it Sahih (authentic), but he was mistaken].