Hexagram 41, Sǔn (Decrease): Line 1
损卦初九 · 山泽损 · 中文版
初九：已事遄往，无咎，酌损之。
The line (Legge)
The first NINE, undivided, shows its subject suspending his own affairs, and hurrying away (to help the subject of the fourth line). He will commit no error, but let him consider how far he should contribute of what is his (for the other).
Small Image commentary
'He suspends his own affairs and hurries away (to help the subject of the fourth line):' - the (subject of that) upper (line) mingles his wishes with his.
象曰：已事遄往，尚合志也。
In plain words
Setting one's own affairs aside and hurrying to help: no fault; but weigh how much to decrease oneself. The first line is strong and corresponds to the fourth, decreasing itself to increase the one above. The Small Image says it values being of one mind with the one above.
Applying it to your situation
If someone needs your help, this line suggests reaching out promptly, but within your means. How much can you give without harming yourself?
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; one is yin and the other yang, so they respond to each other.
If this line moves
With this line moving alone, Sǔn changes into Hexagram 4 Méng (Youthful Folly). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·损之蒙.
The hexagram
Hexagram 41 Sǔn (Decrease). The Judgment: In (what is denoted by) Sun, if there be sincerity (in him who employs it), there will be great good fortune:--freedom from error; firmness and correctness that can be maintained; and advantage in every movement that shall be made. In what shall this (sincerity in the exercise of Sun) be employed? (Even) in sacrifice two baskets of grain, (though there be nothing else), may be presented.
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.