Heaven and earth are witnesses, the sun and moon are warnings, if I fail you, next sentence

"Heaven and earth serve as witnesses, the sun and moon serve as warnings, and if I fail you," the next sentence can be "Heaven and earth will destroy you."

"Heaven and earth are witnesses, and the sun and moon are mirrors. If I fail you, heaven and earth will destroy you." This sentence is usually used to express one person's deep commitment to another person, indicating that the love or vow between them is True, firm and inviolable.