蝃蝀 诗经

蝃蝀在东，莫之敢指。 女子有行，远父母兄弟。 朝隮于西，崇朝其雨。 女子有行，远兄弟父母。 乃如之人也，怀昏姻也。 大无信也，不知命也。

Rainbow (literal translation)

The rainbow is in the east; no one dares point at it. A woman is going away, far from her parents and brothers. The rainbow rises in the west; it will rain all morning. A woman is going away, far from her brothers and parents. Such a person is she, harboring thoughts of marriage. She is utterly untrustworthy, and ignorant of fate.