Hexagram 25, Wú Wàng (Innocence): Line 3
无妄卦六三 · 天雷无妄 · 中文版
六三：无妄之灾，或系之牛，行人之得，邑人之灾。
The line (Legge)
The third SIX, divided, shows calamity happening to one who is free from insincerity - as in the case of an ox that has been tied up. A passer by finds it (and carries it off), while the people in the neighbourhood have the calamity (of being accused and. apprehended).
Small Image commentary
'The passer-by gets the ox:' - this proves a calamity to the people of the neighbourhood.
象曰：行人得牛，邑人灾也。
In plain words
Unexpected misfortune: someone tethers an ox here, a passer-by takes it, and the townspeople fall under suspicion. The Chinese idiom for undeserved misfortune comes from this line. The third line is neither central nor correct; it has done nothing wrong but is caught up anyway. The Small Image says the passer-by gets the ox and the townspeople suffer.
Applying it to your situation
If you have been caught up in something through no fault of your own, this line suggests it may not be your doing, and to steady yourself first. Facing unfairness, what can you do?
Position
A broken (yin) line in the third place, which is a yang (odd) place, so it is not in its proper place. Its partner is line 6; one is yin and the other yang, so they respond to each other.
If this line moves
With this line moving alone, Wú Wàng changes into Hexagram 13 Tóng Rén (Fellowship). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·无妄之同人.
A recorded case from Takashima
Wu Wang to Tong Ren: a partner suddenly cancels: A friend's prospective partner cancelled that day's meeting by letter, citing trouble at home. The third line of Wu Wang, "someone tethers an ox; the traveller's gain is the townsman's loss", led Takashima, reading Li as both ox and woman, to guess that a young woman had been left in the partner's care and brought trouble with her.
The hexagram
Hexagram 25 Wú Wàng (Innocence). The Judgment: Wu Wang indicates great progress and success, while there will be advantage in being firm and correct. If (its subject and his action) be not correct, he will fall into errors, and it will not be advantageous for him to move in any direction.
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English text: James Legge, The Yi King (Sacred Books of the East, vol. 16, 1882), public domain, as transcribed by the Chinese Text Project. Chinese: the received text. Offered for study and reflection, not as prediction. Plain-English readings and position notes by this site.