Hexagram 21, Shì Kè (Biting Through): Line 1
噬嗑卦初九 · 火雷噬嗑 · 中文版
初九：屦校灭趾，无咎。
The line (Legge)
The first NINE, undivided, shows one with his feet in the stocks and deprived of his toes. There will be no error.
Small Image commentary
'His feet are in the stocks, and he is deprived of his toes:' - there is no walking (to do evil).
象曰：屦校灭趾，不行也。
In plain words
Feet in the stocks, toes hidden: no fault. The first line is the start of punishment: the offence is small and so is the penalty, and after a small lesson one does not offend again. The Small Image says this stops one from going further. The Great Commentary says a small punishment that brings a great warning is good fortune for the petty person.
Applying it to your situation
If you have just made a small mistake and learned from it, this line suggests that is not necessarily bad: stopping early is best. What bigger mistake did this small lesson help you avoid?
Position
A solid (yang) line in the first place, which is a yang (odd) place, so it is in its proper place. Its partner is line 4; both are yang, so they do not respond.
If this line moves
With this line moving alone, Shì Kè changes into Hexagram 35 Jìn (Progress). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·噬嗑之晋.
The hexagram
Hexagram 21 Shì Kè (Biting Through). The Judgment: Shi He indicates successful progress (in the condition of things which it supposes). It will be advantageous to use legal constraints.
Next: Line 2
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.